Merge pull request 'development_new_ui_version' (#1) from development_new_ui_version into master

Reviewed-on: #1

.gitignore

@@ -0,0 +1 @@
+.venv

collections/7madah/tests/sub_tests/file1.md

@@ -0,0 +1,22 @@
+# Start to end file
+
+### Graph
+
+---
+
+This is just for testing
+
+---
+
+**See what i did?**
+
+---
+
+```mermaid
+graph TD
+    A[Start] --> B{Process};
+    B --> C{Decision};
+    C -- Yes --> D[End Yes];
+    C -- No --> E[End No];
+```
+

collections/7madah/tests/test3.md

@@ -0,0 +1,426 @@
+# UI Code Refactoring Plan
+
+**Project:** Markdown Editor  
+**Date:** 2025-10-26  
+**Status:** In Progress
+
+---
+
+## Executive Summary
+
+This document outlines a comprehensive refactoring plan for the UI codebase to improve maintainability, remove dead code, extract utilities, and standardize patterns. The refactoring is organized into 6 phases with 14 tasks, prioritized by risk and impact.
+
+**Key Metrics:**
+
+- Total Lines of Code: ~3,587
+- Dead Code to Remove: 213 lines (6%)
+- Estimated Effort: 5-8 days
+- Risk Level: Mostly LOW to MEDIUM
+
+---
+
+## Phase 1: Analysis Summary
+
+### Files Reviewed
+
+**JavaScript Files (10):**
+
+- `/static/js/app.js` (484 lines)
+- `/static/js/column-resizer.js` (100 lines)
+- `/static/js/confirmation.js` (170 lines)
+- `/static/js/editor.js` (420 lines)
+- `/static/js/file-tree-actions.js` (482 lines)
+- `/static/js/file-tree.js` (865 lines)
+- `/static/js/macro-parser.js` (103 lines)
+- `/static/js/macro-processor.js` (157 lines)
+- `/static/js/ui-utils.js` (305 lines)
+- `/static/js/webdav-client.js` (266 lines)
+
+**CSS Files (6):**
+
+- `/static/css/variables.css` (32 lines)
+- `/static/css/layout.css`
+- `/static/css/file-tree.css`
+- `/static/css/editor.css`
+- `/static/css/components.css`
+- `/static/css/modal.css`
+
+**HTML Templates (1):**
+
+- `/templates/index.html` (203 lines)
+
+---
+
+## Issues Found
+
+### 🔴 HIGH PRIORITY
+
+1. **Deprecated Modal Code (Dead Code)**
+   - Location: `/static/js/file-tree-actions.js` lines 262-474
+   - Impact: 213 lines of unused code (44% of file)
+   - Risk: LOW to remove
+
+2. **Duplicated Event Bus Implementation**
+   - Location: `/static/js/app.js` lines 16-30
+   - Should be extracted to reusable module
+
+3. **Duplicated Debounce Function**
+   - Location: `/static/js/editor.js` lines 404-414
+   - Should be shared utility
+
+4. **Inconsistent Notification Usage**
+   - Mixed usage of `window.showNotification` vs `showNotification`
+
+5. **Duplicated File Download Logic**
+   - Location: `/static/js/file-tree.js` lines 829-839
+   - Should be shared utility
+
+6. **Hard-coded Values**
+   - Long-press threshold: 400ms
+   - Debounce delay: 300ms
+   - Drag preview width: 200px
+   - Toast delay: 3000ms
+
+### 🟡 MEDIUM PRIORITY
+
+7. **Global State Management**
+   - Location: `/static/js/app.js` lines 6-13
+   - Makes testing difficult
+
+8. **Duplicated Path Manipulation**
+   - `path.split('/').pop()` appears 10+ times
+   - `path.substring(0, path.lastIndexOf('/'))` appears 5+ times
+
+9. **Mixed Responsibility in ui-utils.js**
+   - Contains 6 different classes/utilities
+   - Should be split into separate modules
+
+10. **Deprecated Event Handler**
+    - Location: `/static/js/file-tree-actions.js` line 329
+    - Uses deprecated `onkeypress`
+
+### 🟢 LOW PRIORITY
+
+11. **Unused Function Parameters**
+12. **Magic Numbers in Styling**
+13. **Inconsistent Comment Styles**
+14. **Console.log Statements**
+
+---
+
+## Phase 2: Proposed Reusable Components
+
+### 1. Config Module (`/static/js/config.js`)
+
+Centralize all configuration values:
+
+```javascript
+export const Config = {
+    // Timing
+    LONG_PRESS_THRESHOLD: 400,
+    DEBOUNCE_DELAY: 300,
+    TOAST_DURATION: 3000,
+    
+    // UI
+    DRAG_PREVIEW_WIDTH: 200,
+    TREE_INDENT_PX: 12,
+    MOUSE_MOVE_THRESHOLD: 5,
+    
+    // Validation
+    FILENAME_PATTERN: /^[a-z0-9_]+(\.[a-z0-9_]+)*$/,
+    
+    // Storage Keys
+    STORAGE_KEYS: {
+        DARK_MODE: 'darkMode',
+        SELECTED_COLLECTION: 'selectedCollection',
+        LAST_VIEWED_PAGE: 'lastViewedPage',
+        COLUMN_DIMENSIONS: 'columnDimensions'
+    }
+};
+```
+
+### 2. Logger Module (`/static/js/logger.js`)
+
+Structured logging with levels:
+
+```javascript
+export class Logger {
+    static debug(message, ...args)
+    static info(message, ...args)
+    static warn(message, ...args)
+    static error(message, ...args)
+    static setLevel(level)
+}
+```
+
+### 3. Event Bus Module (`/static/js/event-bus.js`)
+
+Centralized event system:
+
+```javascript
+export class EventBus {
+    on(event, callback)
+    off(event, callback)
+    once(event, callback)
+    dispatch(event, data)
+    clear(event)
+}
+```
+
+### 4. Utilities Module (`/static/js/utils.js`)
+
+Common utility functions:
+
+```javascript
+export const PathUtils = {
+    getFileName(path),
+    getParentPath(path),
+    normalizePath(path),
+    joinPaths(...paths),
+    getExtension(path)
+};
+
+export const TimingUtils = {
+    debounce(func, wait),
+    throttle(func, wait)
+};
+
+export const DownloadUtils = {
+    triggerDownload(content, filename),
+    downloadAsBlob(blob, filename)
+};
+
+export const ValidationUtils = {
+    validateFileName(name, isFolder),
+    sanitizeFileName(name)
+};
+```
+
+### 5. Notification Service (`/static/js/notification-service.js`)
+
+Standardized notifications:
+
+```javascript
+export class NotificationService {
+    static success(message)
+    static error(message)
+    static warning(message)
+    static info(message)
+}
+```
+
+---
+
+## Phase 3: Refactoring Tasks
+
+### 🔴 HIGH PRIORITY
+
+**Task 1: Remove Dead Code**
+
+- Files: `/static/js/file-tree-actions.js`
+- Lines: 262-474 (213 lines)
+- Risk: LOW
+- Dependencies: None
+
+**Task 2: Extract Event Bus**
+
+- Files: NEW `/static/js/event-bus.js`, MODIFY `app.js`, `editor.js`
+- Risk: MEDIUM
+- Dependencies: None
+
+**Task 3: Create Utilities Module**
+
+- Files: NEW `/static/js/utils.js`, MODIFY multiple files
+- Risk: MEDIUM
+- Dependencies: None
+
+**Task 4: Create Config Module**
+
+- Files: NEW `/static/js/config.js`, MODIFY multiple files
+- Risk: LOW
+- Dependencies: None
+
+**Task 5: Standardize Notification Usage**
+
+- Files: NEW `/static/js/notification-service.js`, MODIFY multiple files
+- Risk: LOW
+- Dependencies: None
+
+### 🟡 MEDIUM PRIORITY
+
+**Task 6: Fix Deprecated Event Handler**
+
+- Files: `/static/js/file-tree-actions.js` line 329
+- Risk: LOW
+- Dependencies: None
+
+**Task 7: Refactor ui-utils.js**
+
+- Files: DELETE `ui-utils.js`, CREATE 5 new modules
+- Risk: HIGH
+- Dependencies: Task 5
+
+**Task 8: Standardize Class Export Pattern**
+
+- Files: All class files
+- Risk: MEDIUM
+- Dependencies: None
+
+**Task 9: Create Logger Module**
+
+- Files: NEW `/static/js/logger.js`, MODIFY multiple files
+- Risk: LOW
+- Dependencies: None
+
+**Task 10: Implement Download Action**
+
+- Files: `/static/js/file-tree-actions.js`
+- Risk: LOW
+- Dependencies: Task 3
+
+### 🟢 LOW PRIORITY
+
+**Task 11: Standardize JSDoc Comments**
+**Task 12: Extract Magic Numbers to CSS**
+**Task 13: Add Error Boundaries**
+**Task 14: Cache DOM Elements**
+
+---
+
+## Phase 4: Implementation Order
+
+### Step 1: Foundation (Do First)
+
+1. Create Config Module (Task 4)
+2. Create Logger Module (Task 9)
+3. Create Event Bus Module (Task 2)
+
+### Step 2: Utilities (Do Second)
+
+4. Create Utilities Module (Task 3)
+5. Create Notification Service (Task 5)
+
+### Step 3: Cleanup (Do Third)
+
+6. Remove Dead Code (Task 1)
+7. Fix Deprecated Event Handler (Task 6)
+
+### Step 4: Restructuring (Do Fourth)
+
+8. Refactor ui-utils.js (Task 7)
+9. Standardize Class Export Pattern (Task 8)
+
+### Step 5: Enhancements (Do Fifth)
+
+10. Implement Download Action (Task 10)
+11. Add Error Boundaries (Task 13)
+
+### Step 6: Polish (Do Last)
+
+12. Standardize JSDoc Comments (Task 11)
+13. Extract Magic Numbers to CSS (Task 12)
+14. Cache DOM Elements (Task 14)
+
+---
+
+## Phase 5: Testing Checklist
+
+### Core Functionality
+
+- [ ] File tree loads and displays correctly
+- [ ] Files can be selected and opened
+- [ ] Folders can be expanded/collapsed
+- [ ] Editor loads file content
+- [ ] Preview renders markdown correctly
+- [ ] Save button saves files
+- [ ] Delete button deletes files
+- [ ] New button creates new files
+
+### Context Menu Actions
+
+- [ ] Right-click shows context menu
+- [ ] New file action works
+- [ ] New folder action works
+- [ ] Rename action works
+- [ ] Delete action works
+- [ ] Copy/Cut/Paste actions work
+- [ ] Upload action works
+
+### Drag and Drop
+
+- [ ] Long-press detection works
+- [ ] Drag preview appears correctly
+- [ ] Drop targets highlight properly
+- [ ] Files can be moved
+- [ ] Undo (Ctrl+Z) works
+
+### Modals
+
+- [ ] Confirmation modals appear
+- [ ] Prompt modals appear
+- [ ] Modals don't double-open
+- [ ] Enter/Escape keys work
+
+### UI Features
+
+- [ ] Dark mode toggle works
+- [ ] Collection selector works
+- [ ] Column resizers work
+- [ ] Notifications appear
+- [ ] URL routing works
+- [ ] View/Edit modes work
+
+---
+
+## Recommendations
+
+### Immediate Actions (Before Production)
+
+1. Remove dead code (Task 1)
+2. Fix deprecated event handler (Task 6)
+3. Create config module (Task 4)
+
+### Short-term Actions (Next Sprint)
+
+4. Extract utilities (Task 3)
+5. Standardize notifications (Task 5)
+6. Create event bus (Task 2)
+
+### Medium-term Actions (Future Sprints)
+
+7. Refactor ui-utils.js (Task 7)
+8. Add logger (Task 9)
+9. Standardize exports (Task 8)
+
+---
+
+## Success Metrics
+
+**Before Refactoring:**
+
+- Total Lines: ~3,587
+- Dead Code: 213 lines (6%)
+- Duplicated Code: ~50 lines
+- Hard-coded Values: 15+
+
+**After Refactoring:**
+
+- Total Lines: ~3,400 (-5%)
+- Dead Code: 0 lines
+- Duplicated Code: 0 lines
+- Hard-coded Values: 0
+
+**Estimated Effort:** 5-8 days
+
+---
+
+## Conclusion
+
+The UI codebase is generally well-structured. Main improvements needed:
+
+1. Remove dead code
+2. Extract duplicated utilities
+3. Centralize configuration
+4. Standardize patterns
+
+Start with high-impact, low-risk changes first to ensure production readiness.

collections/documents/docusaurus.md

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+## Using Docusaurus
+
+Once you've set up Hero, you can use it to develop, manage and publish Docusaurus websites.
+
+## Launch the Hero Website
+
+To start a Hero Docusaurus website in development mode:
+
+- Build the book then close the prompt with `Ctrl+C`
+
+  ```bash
+  hero docs -d
+  ```
+
+- See the book on the local browser
+
+  ```
+  bash /root/hero/var/docusaurus/develop.sh
+  ```
+
+You can then view the website in your browser at `https://localhost:3100`.
+
+## Publish a Website
+
+- To build and publish a Hero website:
+  - Development
+
+    ```bash
+    hero docs -bpd
+    ```
+
+  - Production
+
+    ```bash
+    hero docs -bp
+    ```
+
+If you want to specify a different SSH key, use `-dk`:
+
+```bash
+hero docs -bpd -dk ~/.ssh/id_ed25519
+```
+
+> Note: The container handles the SSH agent and key management automatically on startup, so in most cases, you won't need to manually specify keys.

collections/documents/getting_started/hero_docker.md

@@ -0,0 +1,67 @@
+You can build Hero as a Docker container.
+
+The code is availabe at this [open-source repository](https://github.com/mik-tf/hero-container).
+
+## Prerequisites
+
+- Docker installed on your system (More info [here](https://manual.grid.tf/documentation/system_administrators/computer_it_basics/docker_basics.html#install-docker-desktop-and-docker-engine))
+- SSH keys for deploying Hero websites (if publishing)
+
+## Build the Image
+
+- Clone the repository
+
+    ```
+    git clone https://github.com/mik-tf/hero-container
+    cd hero-container
+    ```
+
+- Build the Docker image:
+
+    ```bash
+    docker build -t heroc .
+    ```
+
+## Pull the Image from Docker Hub
+
+If you don't want to build the image, you can pull it from Docker Hub.
+
+```
+docker pull logismosis/heroc
+```
+
+In this case, use `logismosi/heroc` instead of `heroc` to use the container.
+
+## Run the Hero Container
+
+You can run the container with an interactive shell:
+
+```bash
+docker run -it heroc
+```
+
+You can run the container with an interactive shell, while setting the host as your local network, mounting your current directory as the workspace and adding your SSH keys:
+
+```bash
+docker run --network=host \
+  -v $(pwd):/workspace \
+  -v ~/.ssh:/root/ssh \
+  -it heroc
+```
+
+By default, the container will:
+
+- Start Redis server in the background
+- Copy your SSH keys to the proper location
+- Initialize the SSH agent
+- Add your default SSH key (`id_ed25519`)
+
+To use a different SSH key, specify it with the KEY environment variable (e.g. `KEY=id_ed25519`):
+
+```bash
+docker run --network=host \
+  -v $(pwd):/workspace \
+  -v ~/.ssh:/root/ssh \
+  -e KEY=your_custom_key_name \
+  -it heroc
+```

collections/documents/getting_started/hero_native.md

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+## Basic Hero
+
+You can build Hero natively with the following lines:
+
+```
+curl https://raw.githubusercontent.com/freeflowuniverse/herolib/refs/heads/development/install_hero.sh > /tmp/install_hero.sh
+bash /tmp/install_hero.sh
+```
+
+## Hero for Developers
+
+For developers, use the following commands:
+
+```
+curl 'https://raw.githubusercontent.com/freeflowuniverse/herolib/refs/heads/development/install_v.sh' > /tmp/install_v.sh
+bash /tmp/install_v.sh --analyzer --herolib 
+#DONT FORGET TO START A NEW SHELL (otherwise the paths will not be set)
+```
+
+## Hero with Docker
+
+If you have issues running Hero natively, you can use the [Docker version of Hero](hero_docker.md).

collections/documents/intro.md

@@ -0,0 +1,5 @@
+This ebook contains the basic information to get you started with the Hero tool.
+
+## What is Hero?
+
+Hero is an open-source toolset to work with Git, AI, mdBook, Docusaurus, Starlight and more.

collections/documents/support.md

@@ -0,0 +1 @@
+If you need help with Hero, reach out to the ThreeFold Support team [here](https://threefoldfaq.crisp.help/en/).

collections/notes/introduction.md

@@ -0,0 +1,18 @@
+# Introduction
+
+### This is an introduction
+
+
+* **This is an internal image**
+
+---
+
+![My company logo](/images/logo-blue.png "Company Logo")
+
+---
+
+* **This is an external image**
+
+![My company logo](https://images.pexels.com/photos/1054655/pexels-photo-1054655.jpeg "Another image")
+
+---

collections/notes/new_folder/zeko.md

@@ -0,0 +1,2 @@
+# New File
+

collections/notes/presentation.md

@@ -0,0 +1,40 @@
+## Mycelium Product Presentation
+
+This document provides an overview of the Mycelium technology stack (as commercially sold my our company GeoMind).
+
+<div style={{
+  position: 'relative',
+  width: '100%',
+  height: 0,
+  paddingTop: '56.25%',
+  marginTop: '1.6em',
+  marginBottom: '0.9em',
+  overflow: 'hidden',
+  borderRadius: '8px',
+  willChange: 'transform'
+}}>
+  <iframe
+    src="https://www.canva.com/design/DAG0UtzICsk/rqXpn5f3ibo2OpX-yDWmPQ/view?embed"
+    style={{
+      position: 'absolute',
+      width: '100%',
+      height: '100%',
+      top: 0,
+      left: 0,
+      border: 'none',
+      padding: 0,
+      margin: 0
+    }}
+    allowFullScreen={true}
+    allow="fullscreen">
+  </iframe>
+</div>
+
+<div style={{ marginTop: '10px' }}>
+  <a href="https://www.canva.com/design/DAG0UtzICsk/rqXpn5f3ibo2OpX-yDWmPQ/view"
+     target="_blank"
+     rel="noopener"
+     style={{ textDecoration: 'none' }}>
+    Geomind Product Intro 2025 (based on mycelium technology)
+  </a>
+</div>

collections/notes/test.md

@@ -1,10 +0,0 @@
-
-# test
-
-- 1
-- 2
-
-[2025 SeaweedFS Intro Slides.pdf](/notes/2025 SeaweedFS Intro Slides.pdf)
-
-
-

collections/notes/tests/test.md

@@ -0,0 +1,9 @@
+
+# test
+
+- 1
+- 2
+
+
+
+!!include path:test2.md

collections/notes/tests/test2.md

@@ -0,0 +1,12 @@
+
+## test2
+
+- something
+- another thing
+
+
+
+
+
+
+

collections/notes/tests/test3.md

@@ -0,0 +1,426 @@
+# UI Code Refactoring Plan
+
+**Project:** Markdown Editor  
+**Date:** 2025-10-26  
+**Status:** In Progress
+
+---
+
+## Executive Summary
+
+This document outlines a comprehensive refactoring plan for the UI codebase to improve maintainability, remove dead code, extract utilities, and standardize patterns. The refactoring is organized into 6 phases with 14 tasks, prioritized by risk and impact.
+
+**Key Metrics:**
+
+- Total Lines of Code: ~3,587
+- Dead Code to Remove: 213 lines (6%)
+- Estimated Effort: 5-8 days
+- Risk Level: Mostly LOW to MEDIUM
+
+---
+
+## Phase 1: Analysis Summary
+
+### Files Reviewed
+
+**JavaScript Files (10):**
+
+- `/static/js/app.js` (484 lines)
+- `/static/js/column-resizer.js` (100 lines)
+- `/static/js/confirmation.js` (170 lines)
+- `/static/js/editor.js` (420 lines)
+- `/static/js/file-tree-actions.js` (482 lines)
+- `/static/js/file-tree.js` (865 lines)
+- `/static/js/macro-parser.js` (103 lines)
+- `/static/js/macro-processor.js` (157 lines)
+- `/static/js/ui-utils.js` (305 lines)
+- `/static/js/webdav-client.js` (266 lines)
+
+**CSS Files (6):**
+
+- `/static/css/variables.css` (32 lines)
+- `/static/css/layout.css`
+- `/static/css/file-tree.css`
+- `/static/css/editor.css`
+- `/static/css/components.css`
+- `/static/css/modal.css`
+
+**HTML Templates (1):**
+
+- `/templates/index.html` (203 lines)
+
+---
+
+## Issues Found
+
+### 🔴 HIGH PRIORITY
+
+1. **Deprecated Modal Code (Dead Code)**
+   - Location: `/static/js/file-tree-actions.js` lines 262-474
+   - Impact: 213 lines of unused code (44% of file)
+   - Risk: LOW to remove
+
+2. **Duplicated Event Bus Implementation**
+   - Location: `/static/js/app.js` lines 16-30
+   - Should be extracted to reusable module
+
+3. **Duplicated Debounce Function**
+   - Location: `/static/js/editor.js` lines 404-414
+   - Should be shared utility
+
+4. **Inconsistent Notification Usage**
+   - Mixed usage of `window.showNotification` vs `showNotification`
+
+5. **Duplicated File Download Logic**
+   - Location: `/static/js/file-tree.js` lines 829-839
+   - Should be shared utility
+
+6. **Hard-coded Values**
+   - Long-press threshold: 400ms
+   - Debounce delay: 300ms
+   - Drag preview width: 200px
+   - Toast delay: 3000ms
+
+### 🟡 MEDIUM PRIORITY
+
+7. **Global State Management**
+   - Location: `/static/js/app.js` lines 6-13
+   - Makes testing difficult
+
+8. **Duplicated Path Manipulation**
+   - `path.split('/').pop()` appears 10+ times
+   - `path.substring(0, path.lastIndexOf('/'))` appears 5+ times
+
+9. **Mixed Responsibility in ui-utils.js**
+   - Contains 6 different classes/utilities
+   - Should be split into separate modules
+
+10. **Deprecated Event Handler**
+    - Location: `/static/js/file-tree-actions.js` line 329
+    - Uses deprecated `onkeypress`
+
+### 🟢 LOW PRIORITY
+
+11. **Unused Function Parameters**
+12. **Magic Numbers in Styling**
+13. **Inconsistent Comment Styles**
+14. **Console.log Statements**
+
+---
+
+## Phase 2: Proposed Reusable Components
+
+### 1. Config Module (`/static/js/config.js`)
+
+Centralize all configuration values:
+
+```javascript
+export const Config = {
+    // Timing
+    LONG_PRESS_THRESHOLD: 400,
+    DEBOUNCE_DELAY: 300,
+    TOAST_DURATION: 3000,
+    
+    // UI
+    DRAG_PREVIEW_WIDTH: 200,
+    TREE_INDENT_PX: 12,
+    MOUSE_MOVE_THRESHOLD: 5,
+    
+    // Validation
+    FILENAME_PATTERN: /^[a-z0-9_]+(\.[a-z0-9_]+)*$/,
+    
+    // Storage Keys
+    STORAGE_KEYS: {
+        DARK_MODE: 'darkMode',
+        SELECTED_COLLECTION: 'selectedCollection',
+        LAST_VIEWED_PAGE: 'lastViewedPage',
+        COLUMN_DIMENSIONS: 'columnDimensions'
+    }
+};
+```
+
+### 2. Logger Module (`/static/js/logger.js`)
+
+Structured logging with levels:
+
+```javascript
+export class Logger {
+    static debug(message, ...args)
+    static info(message, ...args)
+    static warn(message, ...args)
+    static error(message, ...args)
+    static setLevel(level)
+}
+```
+
+### 3. Event Bus Module (`/static/js/event-bus.js`)
+
+Centralized event system:
+
+```javascript
+export class EventBus {
+    on(event, callback)
+    off(event, callback)
+    once(event, callback)
+    dispatch(event, data)
+    clear(event)
+}
+```
+
+### 4. Utilities Module (`/static/js/utils.js`)
+
+Common utility functions:
+
+```javascript
+export const PathUtils = {
+    getFileName(path),
+    getParentPath(path),
+    normalizePath(path),
+    joinPaths(...paths),
+    getExtension(path)
+};
+
+export const TimingUtils = {
+    debounce(func, wait),
+    throttle(func, wait)
+};
+
+export const DownloadUtils = {
+    triggerDownload(content, filename),
+    downloadAsBlob(blob, filename)
+};
+
+export const ValidationUtils = {
+    validateFileName(name, isFolder),
+    sanitizeFileName(name)
+};
+```
+
+### 5. Notification Service (`/static/js/notification-service.js`)
+
+Standardized notifications:
+
+```javascript
+export class NotificationService {
+    static success(message)
+    static error(message)
+    static warning(message)
+    static info(message)
+}
+```
+
+---
+
+## Phase 3: Refactoring Tasks
+
+### 🔴 HIGH PRIORITY
+
+**Task 1: Remove Dead Code**
+
+- Files: `/static/js/file-tree-actions.js`
+- Lines: 262-474 (213 lines)
+- Risk: LOW
+- Dependencies: None
+
+**Task 2: Extract Event Bus**
+
+- Files: NEW `/static/js/event-bus.js`, MODIFY `app.js`, `editor.js`
+- Risk: MEDIUM
+- Dependencies: None
+
+**Task 3: Create Utilities Module**
+
+- Files: NEW `/static/js/utils.js`, MODIFY multiple files
+- Risk: MEDIUM
+- Dependencies: None
+
+**Task 4: Create Config Module**
+
+- Files: NEW `/static/js/config.js`, MODIFY multiple files
+- Risk: LOW
+- Dependencies: None
+
+**Task 5: Standardize Notification Usage**
+
+- Files: NEW `/static/js/notification-service.js`, MODIFY multiple files
+- Risk: LOW
+- Dependencies: None
+
+### 🟡 MEDIUM PRIORITY
+
+**Task 6: Fix Deprecated Event Handler**
+
+- Files: `/static/js/file-tree-actions.js` line 329
+- Risk: LOW
+- Dependencies: None
+
+**Task 7: Refactor ui-utils.js**
+
+- Files: DELETE `ui-utils.js`, CREATE 5 new modules
+- Risk: HIGH
+- Dependencies: Task 5
+
+**Task 8: Standardize Class Export Pattern**
+
+- Files: All class files
+- Risk: MEDIUM
+- Dependencies: None
+
+**Task 9: Create Logger Module**
+
+- Files: NEW `/static/js/logger.js`, MODIFY multiple files
+- Risk: LOW
+- Dependencies: None
+
+**Task 10: Implement Download Action**
+
+- Files: `/static/js/file-tree-actions.js`
+- Risk: LOW
+- Dependencies: Task 3
+
+### 🟢 LOW PRIORITY
+
+**Task 11: Standardize JSDoc Comments**
+**Task 12: Extract Magic Numbers to CSS**
+**Task 13: Add Error Boundaries**
+**Task 14: Cache DOM Elements**
+
+---
+
+## Phase 4: Implementation Order
+
+### Step 1: Foundation (Do First)
+
+1. Create Config Module (Task 4)
+2. Create Logger Module (Task 9)
+3. Create Event Bus Module (Task 2)
+
+### Step 2: Utilities (Do Second)
+
+4. Create Utilities Module (Task 3)
+5. Create Notification Service (Task 5)
+
+### Step 3: Cleanup (Do Third)
+
+6. Remove Dead Code (Task 1)
+7. Fix Deprecated Event Handler (Task 6)
+
+### Step 4: Restructuring (Do Fourth)
+
+8. Refactor ui-utils.js (Task 7)
+9. Standardize Class Export Pattern (Task 8)
+
+### Step 5: Enhancements (Do Fifth)
+
+10. Implement Download Action (Task 10)
+11. Add Error Boundaries (Task 13)
+
+### Step 6: Polish (Do Last)
+
+12. Standardize JSDoc Comments (Task 11)
+13. Extract Magic Numbers to CSS (Task 12)
+14. Cache DOM Elements (Task 14)
+
+---
+
+## Phase 5: Testing Checklist
+
+### Core Functionality
+
+- [ ] File tree loads and displays correctly
+- [ ] Files can be selected and opened
+- [ ] Folders can be expanded/collapsed
+- [ ] Editor loads file content
+- [ ] Preview renders markdown correctly
+- [ ] Save button saves files
+- [ ] Delete button deletes files
+- [ ] New button creates new files
+
+### Context Menu Actions
+
+- [ ] Right-click shows context menu
+- [ ] New file action works
+- [ ] New folder action works
+- [ ] Rename action works
+- [ ] Delete action works
+- [ ] Copy/Cut/Paste actions work
+- [ ] Upload action works
+
+### Drag and Drop
+
+- [ ] Long-press detection works
+- [ ] Drag preview appears correctly
+- [ ] Drop targets highlight properly
+- [ ] Files can be moved
+- [ ] Undo (Ctrl+Z) works
+
+### Modals
+
+- [ ] Confirmation modals appear
+- [ ] Prompt modals appear
+- [ ] Modals don't double-open
+- [ ] Enter/Escape keys work
+
+### UI Features
+
+- [ ] Dark mode toggle works
+- [ ] Collection selector works
+- [ ] Column resizers work
+- [ ] Notifications appear
+- [ ] URL routing works
+- [ ] View/Edit modes work
+
+---
+
+## Recommendations
+
+### Immediate Actions (Before Production)
+
+1. Remove dead code (Task 1)
+2. Fix deprecated event handler (Task 6)
+3. Create config module (Task 4)
+
+### Short-term Actions (Next Sprint)
+
+4. Extract utilities (Task 3)
+5. Standardize notifications (Task 5)
+6. Create event bus (Task 2)
+
+### Medium-term Actions (Future Sprints)
+
+7. Refactor ui-utils.js (Task 7)
+8. Add logger (Task 9)
+9. Standardize exports (Task 8)
+
+---
+
+## Success Metrics
+
+**Before Refactoring:**
+
+- Total Lines: ~3,587
+- Dead Code: 213 lines (6%)
+- Duplicated Code: ~50 lines
+- Hard-coded Values: 15+
+
+**After Refactoring:**
+
+- Total Lines: ~3,400 (-5%)
+- Dead Code: 0 lines
+- Duplicated Code: 0 lines
+- Hard-coded Values: 0
+
+**Estimated Effort:** 5-8 days
+
+---
+
+## Conclusion
+
+The UI codebase is generally well-structured. Main improvements needed:
+
+1. Remove dead code
+2. Extract duplicated utilities
+3. Centralize configuration
+4. Standardize patterns
+
+Start with high-impact, low-risk changes first to ensure production readiness.

collections/notes/why.md

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+**Decentralized Infrastructure Technology for Everyone, Everywhere**
+
+Mycelium is a comprehensive DePIN (Decentralized Physical Infrastructure) system designed to scale to planetary level, capable of providing resilient services with end-to-end encryption, and enabling any machine and human to communicate efficiently over optimal paths.
+
+Mycelium is Compatible with Kubernetes, Docker, VMs, Web2, Web3 – and building towards Web4.
+
+## Terminology Clarification
+
+- **Mycelium Tech**: The core technology stack (ZOS, QSS, Mycelium Network)
+- **ThreeFold Grid**: The decentralized infrastructure offering built on Mycelium Tech
+- **GeoMind**: The commercial tech company operating tier-S/H datacenters with Mycelium
+
+## Why Decentralized Infrastructure Matters
+
+Traditional internet infrastructure is burdened with inefficiencies, risks, and growing dependency on centralization.
+
+### **The Challenges We Face**  
+
+- **Centralization Risks**: Digital infrastructure is controlled by a few corporations, compromising autonomy and creating single points of failure.  
+- **Economic Inefficiency**: Current infrastructure models extract value from local economies, funneling resources to centralized providers.
+- **Outdated Protocols**: TCP/IP, the internet's core protocol, was never designed for modern needs like dynamic networks, security, and session management.
+- **Geographic Inefficiency**: Over 70% of the world relies on distant infrastructure, making access expensive, unreliable, and dependent on fragile global systems.
+- **Limited Access**: Over 50% of the world lacks decent internet access, widening opportunity gaps.
+
+Mycelium addresses these challenges through a complete, integrated technology stack designed from first principles.
+
+## What Mycelium Provides
+
+Mycelium is unique in its ability to deliver an integrated platform covering all three fundamental layers of internet infrastructure:
+
+### **Compute Layer** - ZOS
+- Autonomous, stateless operating system
+- MyImage architecture (up to 100x faster deployment)
+- Deterministic, cryptographically verified deployment
+- Supports Kubernetes, containers, VMs, and Linux workloads
+- Self-healing with no manual maintenance required
+
+### **Storage Layer** - Quantum Safe Storage (QSS)
+- Mathematical encoding with forward error correction
+- 20% overhead vs 400% for traditional replication
+- Zero-knowledge design: storage nodes can't access data
+- Petabyte-to-zetabyte scalability
+- Self-healing bitrot protection
+
+### **Network Layer** - Mycelium Network
+- End-to-end encrypted IPv6 overlay
+- Shortest-path optimization
+- Multi-protocol support (TCP, QUIC, UDP, satellite, wireless)
+- Peer-to-peer architecture with no central points of failure
+- Distributed secure name services
+
+## Key Differentiators
+
+| Feature                  | Mycelium                                     | Traditional Cloud                          |
+| ------------------------ | -------------------------------------------- | ------------------------------------------ |
+| **Architecture**         | Distributed peer-to-peer, no central control | Centralized control planes                 |
+| **Deployment**           | Stateless network boot, zero-install         | Local image installation                   |
+| **Storage Efficiency**   | 20% overhead                                 | 300-400% overhead                          |
+| **Security**             | End-to-end encrypted, zero-knowledge design  | Perimeter-based, trust intermediaries      |
+| **Energy**               | Up to 10x more efficient                     | Higher consumption                         |
+| **Autonomy**             | Self-healing, autonomous agents              | Requires active management                 |
+| **Geographic Awareness** | Shortest path routing, location-aware        | Static routing, no geographic optimization |
+
+## Current Status
+
+- **Deployed**: 20+ countries, 30,000+ vCPU
+- **Proof of Concept**: Technology validated in production
+- **Commercialization**: Beginning phase with enterprise roadmap
+
+## Technology Maturity
+
+- **All our core cloud technology**: Production
+- **Quantum Safe Storage**: Production (6+ years)
+- **Mycelium Network**: Beta 
+- **Deterministic Deployment**: OEM only
+- **FungiStor**: H1 2026
+
+Mycelium represents not just an upgrade to existing infrastructure, but a fundamental rethinking of how internet infrastructure should be built—distributed, autonomous, secure, and efficient.%   

collections/tech/introduction.md

@@ -0,0 +1,79 @@
+
+**Decentralized Infrastructure Technology for Everyone, Everywhere**
+
+Mycelium is a comprehensive DePIN (Decentralized Physical Infrastructure) system designed to scale to planetary level, capable of providing resilient services with end-to-end encryption, and enabling any machine and human to communicate efficiently over optimal paths.
+
+Mycelium is Compatible with Kubernetes, Docker, VMs, Web2, Web3 – and building towards Web4.
+
+## Terminology Clarification
+
+- **Mycelium Tech**: The core technology stack (ZOS, QSS, Mycelium Network)
+- **ThreeFold Grid**: The decentralized infrastructure offering built on Mycelium Tech
+- **GeoMind**: The commercial tech company operating tier-S/H datacenters with Mycelium
+
+## Why Decentralized Infrastructure Matters
+
+Traditional internet infrastructure is burdened with inefficiencies, risks, and growing dependency on centralization.
+
+### **The Challenges We Face**  
+
+- **Centralization Risks**: Digital infrastructure is controlled by a few corporations, compromising autonomy and creating single points of failure.  
+- **Economic Inefficiency**: Current infrastructure models extract value from local economies, funneling resources to centralized providers.
+- **Outdated Protocols**: TCP/IP, the internet's core protocol, was never designed for modern needs like dynamic networks, security, and session management.
+- **Geographic Inefficiency**: Over 70% of the world relies on distant infrastructure, making access expensive, unreliable, and dependent on fragile global systems.
+- **Limited Access**: Over 50% of the world lacks decent internet access, widening opportunity gaps.
+
+Mycelium addresses these challenges through a complete, integrated technology stack designed from first principles.
+
+## What Mycelium Provides
+
+Mycelium is unique in its ability to deliver an integrated platform covering all three fundamental layers of internet infrastructure:
+
+### **Compute Layer** - ZOS
+- Autonomous, stateless operating system
+- MyImage architecture (up to 100x faster deployment)
+- Deterministic, cryptographically verified deployment
+- Supports Kubernetes, containers, VMs, and Linux workloads
+- Self-healing with no manual maintenance required
+
+### **Storage Layer** - Quantum Safe Storage (QSS)
+- Mathematical encoding with forward error correction
+- 20% overhead vs 400% for traditional replication
+- Zero-knowledge design: storage nodes can't access data
+- Petabyte-to-zetabyte scalability
+- Self-healing bitrot protection
+
+### **Network Layer** - Mycelium Network
+- End-to-end encrypted IPv6 overlay
+- Shortest-path optimization
+- Multi-protocol support (TCP, QUIC, UDP, satellite, wireless)
+- Peer-to-peer architecture with no central points of failure
+- Distributed secure name services
+
+## Key Differentiators
+
+| Feature                  | Mycelium                                     | Traditional Cloud                          |
+| ------------------------ | -------------------------------------------- | ------------------------------------------ |
+| **Architecture**         | Distributed peer-to-peer, no central control | Centralized control planes                 |
+| **Deployment**           | Stateless network boot, zero-install         | Local image installation                   |
+| **Storage Efficiency**   | 20% overhead                                 | 300-400% overhead                          |
+| **Security**             | End-to-end encrypted, zero-knowledge design  | Perimeter-based, trust intermediaries      |
+| **Energy**               | Up to 10x more efficient                     | Higher consumption                         |
+| **Autonomy**             | Self-healing, autonomous agents              | Requires active management                 |
+| **Geographic Awareness** | Shortest path routing, location-aware        | Static routing, no geographic optimization |
+
+## Current Status
+
+- **Deployed**: 20+ countries, 30,000+ vCPU
+- **Proof of Concept**: Technology validated in production
+- **Commercialization**: Beginning phase with enterprise roadmap
+
+## Technology Maturity
+
+- **All our core cloud technology**: Production
+- **Quantum Safe Storage**: Production (6+ years)
+- **Mycelium Network**: Beta 
+- **Deterministic Deployment**: OEM only
+- **FungiStor**: H1 2026
+
+Mycelium represents not just an upgrade to existing infrastructure, but a fundamental rethinking of how internet infrastructure should be built—distributed, autonomous, secure, and efficient.

collections/tech/presentation.md

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+## Mycelium Product Presentation
+
+This document provides an overview of the Mycelium technology stack (as commercially sold my our company GeoMind).
+
+
+
+<div style={{
+  position: 'relative',
+  width: '100%',
+  height: 0,
+  paddingTop: '56.25%',
+  marginTop: '1.6em',
+  marginBottom: '0.9em',
+  overflow: 'hidden',
+  borderRadius: '8px',
+  willChange: 'transform'
+}}>
+  <iframe
+    src="https://www.canva.com/design/DAG0UtzICsk/rqXpn5f3ibo2OpX-yDWmPQ/view?embed"
+    style={{
+      position: 'absolute',
+      width: '100%',
+      height: '100%',
+      top: 0,
+      left: 0,
+      border: 'none',
+      padding: 0,
+      margin: 0
+    }}
+    allowFullScreen={true}
+    allow="fullscreen">
+  </iframe>
+</div>
+
+<div style={{ marginTop: '10px' }}>
+  <a href="https://www.canva.com/design/DAG0UtzICsk/rqXpn5f3ibo2OpX-yDWmPQ/view"
+     target="_blank"
+     rel="noopener"
+     style={{ textDecoration: 'none' }}>
+    Geomind Product Intro 2025 (based on mycelium technology)
+  </a>
+</div>

collections/tech/roadmap/enterprise_roadmap.md

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+
+# Government, Commercial Hosters, Telco and Enterprise Roadmap
+
+We are working on the government, commercial hosters, telco and enterprise releases of our technology.
+
+> 90% of the work has been done as part of our base offering but we need additional features for enterprises.
+
+## Enterprise User Interface
+
+The current user interface is designed for an open-source tech audience. For enterprise use, we need a different approach to meet the unique needs of enterprise environments:
+
+- **Private or Hybrid Context**: All operations should be conducted within a private or hybrid cloud context to ensure security and compliance.
+- **Enhanced Monitoring**: We need more comprehensive monitoring dashboard screens to provide real-time insights and analytics.
+- **Identity Management Integration**: Integration with enterprise-grade Identity Management solutions, such as LDAP, Active Directory, and SSO (Single Sign-On), is essential.
+- **Enterprise-Friendly UI**: The user interface needs to be redesigned to be more intuitive and tailored to enterprise users, focusing on usability and efficiency.
+- **Token Irrelevance**: Tokens are not a priority in this context and should be de-emphasized in the solution.
+
+## Windows Support
+
+The virtual Machine technology we use does support Windows, but we need to do some further integration.
+
+## High Performance Network Integration
+
+- **Local Network Integration**: ZOS is designed to support a wide range of technologies, though additional integration work is required to optimize performance.
+- **High-Speed Backbones**: We aim to support high-speed Ethernet and RDMA (Infiniband) based backbones.
+- **Instrumentation Enhancements**: Additional instrumentation needs to be incorporated into ZOS to achieve optimal performance.
+- **Target Performance**: Our goal is to achieve network speeds exceeding 100 Gbps.
+- **Custom Integration**: We offer integration with selected network equipment from our customers, accommodating custom integration requirements.
+
+## High Performance Storage Block Device Integration
+
+Next to the existing already integrated storage backends we want to support a high performance redundant storage block device.
+
+- High performance redundant storage network
+- Supports high-speed backbones as defined above
+- Scalable to thousands of machines per cluster.
+- Replication capability between zones.
+- Custom Integration
+  - We offer integration with selected storage equipment from our customers, accommodating custom integration requirements.
+
+## Service Level Management
+
+- The system will have hooks and visualization for achievement of Service levels.
+- This will allow a commercial service provider to get to higher revenue and better uptime management.
+
+## Support for Liquid Cooling Tanks
+
+- Do a test setup in liquid cooling rack or node.
+  - We can use our self-healing capabilities to manage in a better way.
+- This is an integration effort, and not much code changes are needed.

collections/tech/roadmap/hero_roadmap.md

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+
+## AI Agent High Level Roadmap
+
+MyAgent is our private AI agent.
+
+The first version of our MyAgent enables the management of core services such as an innovative database backend, a autonomous decentralized git system, and the automatic integration and deployment of our workloads.
+
+This stack allows everyone to deploy scalable Web 2,3 and 4 apps on top of the TFGrid in a fully automated way.
+
+|                                     | Roadmap                                                                                                      | Timing |
+| ----------------------------------- | ------------------------------------------------------------------------------------------------------------ | ------ |
+| MyAgent Publisher                   | Publish websites, e-books, and more on top of the ThreeFold Grid                                             | H2 25  |
+| MyAgent CI = Continuous Integration | Easier to use Continuous Integration/Development, very powerfull, with multinode support                     | H2 25  |
+| MyAgent Play                        | Integrate declarative automation and configuration management as part of wiki approach in MyAgent Publisher  | H2 25  |
+| MyAgent Git                         | Alternative to centralized Github (based on Gitea), fully integrated on top of TFGrid                        | H2 25  |
+| MyAgent DB                          | Flexible ultra redundant database stor with indexing, queries, stored procedures, super scalable replication | H2 25  |
+| MyAgent OSIS                        | Object Storage and Index system                                                                              | H2 25  |
+| MyAgent WEB                         | Web framework, deployable globally on TFGrid, integrated with Mycelium Net and Names                         | H2 25  |
+| MyAgent Monitor                     | Monitor all your different components on redundant monitoring stack                                          | H2 25  |
+| MyAgent Happs                       | MyAgent natively supports Holochain HAPPS                                                                    | Q4 25  |
+| MyAgent Actors                      | MyAgent can serve actors which respond and act on OpenRPC calls ideal as backend for web or other apps       | Q4 25  |
+| MyAgent Web 3 Gateway               | MyAgent aims to have native support for chosen Web3 partner solutions (Bitcoin, Ethereum, and more)          | Q4 25  |
+
+All of the specs above are fully integrated with the Mycelium Network and the ThreeFold Grid.

collections/tech/roadmap/high_level.md

@@ -0,0 +1,40 @@
+
+![](img/roadmap.jpg)
+
+# Roadmap in Phases
+
+## Phase 1: Wave 1 of Companies, Leading to Our expertise (DONE)
+
+- Technology creation
+  - This was result of 20 years of evolution
+- 7 startups acquired as part of this process
+- Technology used globally by big vendors
+- +600m USD in exits
+
+## Phase 2: Proof of Tech (DONE)
+
+- Open source technology launched globally
+- +60,000,000 active vCPU
+- Large scale proof of core technology
+- Focus on early adoptors in tech space (Cloud, Web2, Web3, etc.)
+- 50m USD funded by founders, community and hosters (people providing capacity)
+
+## Phase 3: Commercialization & Global Expansion (START)
+
+### Phase 3.1: Commercial Partners
+
+- Mycelium Launches with commercial strategic partners
+  - Telco Operatators
+  - IT Integrators
+- Enterprise roadmap delivered within 6 months
+  - This is mainly about integration, documentation and UI work
+- Together with partners we deliver on the many projects which are in our funnel today, e.g., East Africa, Brazil
+
+### Phase 3.2: Large Scale Financancing for Infrastructure
+
+**Large Scaling Financing Round**
+
+- Financing for infrastructure projects (trillions available right now for infrastructures in emerging countries)
+- Public STO (security token offering)
+  - This lets people around the world to co-own the infrastructure for their internet
+- Large partnerships drive alternative to Tier 3 and 4 datacenters

collections/tech/roadmap/tfgrid_roadmap.md

@@ -0,0 +1,50 @@
+
+## High Level Roadmap
+
+### Status Today
+
+The core offering is functioning effectively, maintained through a community-driven, best-effort approach. Currently,
+there are no Service Level Agreements (SLAs) in place, and there should be increased visibility for users regarding their expectations for uptime, performance, and other service related requirements.
+
+The uptime and stability of ZOS are very good.
+
+Additionally, hardware compatibility is excellent, with most machines now supported out of the box.
+
+|                        | Status today                                                                                                            | SDK/API | Web UI |
+| ---------------------- | ----------------------------------------------------------------------------------------------------------------------- | ------- | ------ |
+| ZOS                    | Used for management of +30,000 logical CPU cores                                                                        | yes     | yes    |
+| MyImage (flists)       | Basis for ZOS modules as well as replaces images for VM's ...                                                           | yes     | yes    |
+| MyImage from Docker    | convert docker through our Hub                                                                                          | yes     | yes    |
+| MyImage Hub            | Mycelium is hosting some as well as everyone can install their own Hub                                                  | yes     | yes    |
+| Mycelium Core          | Integrated in ZOS for VM's as well s ZDB and monitoring                                                                 | yes     | yes    |
+| Mycelium Message Bus   | Can be used by any developer for their own usecases                                                                     | NA      | NA     |
+| Quantum Safe Storage   | Usable for experts only, is reliably working for +6 years, +100 MB/sec per stream                                       | yes     | no     |
+| Unbreakable Filesystem | Quantum Safe FS= usable for experts, is a fuse based filesystem on top of the QSS Core                                  | yes     | no     |
+| ZOS Kubernetes         | Working very well, Integrated in ZOS, uses our overlay networks based on Wireguard, can use Quantum Safe FS underneith. | yes     | yes    |
+| ZOS VM's               | The base of our service portfolio, missing is better service level management                                           | yes     | yes    |
+| ZOS Monitoring         | Working well                                                                                                            | yes     | yes    |
+| ZOS VM Monitoring      | Working well, can be retrieved through SDK                                                                              | yes     | yes    |
+| ZOS Web Gateway        | Working well, but documentation not good enough, and not enough of them deployed                                        | yes     | yes    |
+| Zero-Boot              | There are multiple ways active on how to deploy ZOS all are stateless and capable for full secure boot                  | yes     | yes    |
+
+### Planned new features
+
+Considerable effort is being made to enable our partners to go into production;
+however, for this initiative to truly succeed on planetary level, we need many more nodes deployed in the field.
+
+Below you can find some of the planned features of Mycelium Network 4.0 mainly to achieve ability to scale to hundred of thousand of nodes.
+
+|                                 | Roadmap                                                             | Timing  |
+| ------------------------------- | ------------------------------------------------------------------- | ------- |
+| ZOS v4 (our next major release) | V4, without Mycelium Chain, mutual credit, marketplace              | Q2/3 25 |
+| MyImage from Docker             | CI/CD integration (See MyAgent CI/CD)                               | Q1 25   |
+| MyImage Hub Integration         | CI/CD integration (See MyAgent CI/CD) no more need for separate Hub | Q1 25   |
+| Mycelium Core                   | Just more hardening and testing                                     | Q1 25   |
+| Mycelium Message Bus            | Replace our current RMB, all our own RPC over Mycelium              | Q1 25   |
+| ZOS VM's Cloud Slices           | Integration MyAgent CI, use cloud slices to manage                  | Q2 25   |
+| ZOS Monitoring Docu             | More docu and easier API                                            | Q2 25   |
+| ZOS Web Gateway Expansion       | Need more deployed, better integration with new Mycelium            | Q2 25   |
+| Mycelium Names                  | In V4, name services                                                | Q2 25   |
+| ZOS Cloud,Storage,AI Slices     | As part of marketplace for V4, flexible billing mutual credit       | Q3 25   |
+| FungiStor                       | A revolutionary different way how to deliver content                | Q3 25   |
+| MyImage on FungiStor            | Can be stored on FungiStor                                          | Q3 25   |

collections/tech/status.md

@@ -0,0 +1,21 @@
+## Technology Status
+
+![](images/status.png)
+
+The Mycelium technology stack is proven and operational in production environments globally.
+
+Ongoing deployment and enhancement activities continue across the platform, with expanding adoption and application scope.
+
+![](images/dashboard.png)
+
+## Usable for Any Infrastructure Use Case
+
+![](images/usable_by_all.png)
+
+Mycelium is designed to support any infrastructure workload - from traditional cloud applications to edge computing, AI services, and decentralized applications.
+
+## Differentiated Architecture
+
+![](images/unique.png)
+
+Mycelium's unique value lies in its integrated approach: autonomous infrastructure, deterministic deployment, zero-knowledge storage, and optimized networking - delivered as a cohesive platform rather than point solutions.

collections/tech/vision.md

@@ -0,0 +1,21 @@
+![](images/opportunity.png)
+
+## Vision
+
+Building the foundational internet infrastructure layer that is more reliable, safe, private, scalable, and sustainable.
+
+Our technology enables anyone to become an infrastructure provider while maintaining autonomous, self-healing services covering all three fundamental layers of internet architecture.
+
+Our system is unique in its ability to deliver integrated services across compute (ZOS), storage (Quantum Safe Storage), and networking (Mycelium Network) within a single, coherent platform.
+
+## Lets Fix Our Internet
+
+![alt text](images/letsfix.png)
+
+**We are a grounded project:**
+
+- Already deployed in 30+ countries with 30,000+ vCPUs live
+- Proven technology in production for multiple years
+- Complete stack: OS, storage, networking, AI agents
+- Focused on building and proving technology
+- Commercial phase launching with enterprise roadmap

collections/tech/what.md

@@ -0,0 +1,43 @@
+
+## What do we do?
+
+![alt text](images/arch.png)
+
+A truly reliable Internet requires fundamentally better systems for networking (communication), storage (data), and compute. 
+
+Mycelium has built these core technologies from the ground up, enabling anyone to become an infrastructure provider while maintaining autonomous, self-healing services covering all three fundamental layers of internet architecture.
+
+### Authentic, Secure & Globally Scalable Network Technology
+
+- Our Mycelium Network technology enables seamless, private communication between people and machines, anywhere in the world, using the most efficient path available.
+- It integrates with a global edge network of ultra-connected, low-latency supernodes to deliver superior performance and resilience.
+- Mycelium is designed to overcome the limitations of the traditional Internet, such as unreliability, poor performance, and security risks.
+- It provides core services including Naming, Shortest Path Routing, End-to-End Encryption, Authentication, a Secure Message Bus, and Content Delivery.
+
+### Data Storage & Distribution
+
+- Our Quantum-Safe Storage system enables users to store unlimited amounts of data with full ownership and control.
+- As soon as data leaves the application or compute layer, it is encoded in a way that is resistant even to quantum-level attacks.
+- Users have full control over data availability, redundancy, and geographic placement.
+- The system supports multiple interfaces, including IPFS, S3, WebDAV, HTTP, and standard file system access.
+- Data can never be corrupted, and the storage system is self-healing by design.
+
+### Secure Compute
+
+- Self-Managing & Stateless: Requires no manual interactions, enabling fully autonomous operation across global infrastructure.
+- Secure & Deterministic Deployments: Every workload is cryptographically verified and deployed with guaranteed consistency—no room for tampering or drift.
+- Efficient Deployment Storage System (Zero-Image): Achieves up to 100x reduction in image size and transfer using a unique metadata-driven architecture.
+- Compatible: Runs Docker containers, virtual machines, and Linux workloads seamlessly.
+- Smart Contract-Based Deployment: Workloads are governed by cryptographically signed contracts, ensuring transparent, tamper-proof deployment and execution.
+
+## Compare
+
+| Feature                                                                                                                                                       | Others | Mycelium Tech |
+| ------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------ | ------------- |
+| Deterministic Deployments Possible, no one (hacker) can alter state.                                                                                          | NO     | YES           |
+| Autonomous/Self Healing Infrastructure which can scale to the planet.                                                                                         | NO     | YES           |
+| Usable for any web2, web3 workload, compatible with now & future.                                                                                             | NO     | YES           |
+| Data is geo-aware, war & disaster proof.                                                                                                                      | NO     | YES           |
+| Can work in hyperscale datacenters as well as at edge.                                                                                                        | NO     | YES           |
+| Cost effective, can be 3x less                                                                                                                                | NO     | YES           |
+| Networks can always find the shortest path and work over multiple media e.g. satellite, std internet, meshed wireless, lorawan, etc all end to end encrypted. | NO     | YES           |

config.yaml

@@ -1,25 +1,22 @@
-# WsgiDAV Configuration
-# Collections define WebDAV-accessible directories
-
 collections:
   documents:
-    path: "./collections/documents"
-    description: "General documents and notes"
-
+    path: ./collections/documents
+    description: General documents and notes
   notes:
-    path: "./collections/notes"
-    description: "Personal notes and drafts"
-
+    path: ./collections/notes
+    description: Personal notes and drafts
   projects:
-    path: "./collections/projects"
-    description: "Project documentation"
-
-# Server settings
+    path: ./collections/projects
+    description: Project documentation
+  7madah:
+    path: collections/7madah
+    description: 'User-created collection: 7madah'
+  tech:
+    path: collections/tech
+    description: 'User-created collection: tech'
 server:
-  host: "localhost"
+  host: localhost
   port: 8004
-
-# WebDAV settings
 webdav:
   verbose: 1
   enable_loggers: []

refactor-plan.md

@@ -0,0 +1,426 @@
+# UI Code Refactoring Plan
+
+**Project:** Markdown Editor  
+**Date:** 2025-10-26  
+**Status:** In Progress
+
+---
+
+## Executive Summary
+
+This document outlines a comprehensive refactoring plan for the UI codebase to improve maintainability, remove dead code, extract utilities, and standardize patterns. The refactoring is organized into 6 phases with 14 tasks, prioritized by risk and impact.
+
+**Key Metrics:**
+
+- Total Lines of Code: ~3,587
+- Dead Code to Remove: 213 lines (6%)
+- Estimated Effort: 5-8 days
+- Risk Level: Mostly LOW to MEDIUM
+
+---
+
+## Phase 1: Analysis Summary
+
+### Files Reviewed
+
+**JavaScript Files (10):**
+
+- `/static/js/app.js` (484 lines)
+- `/static/js/column-resizer.js` (100 lines)
+- `/static/js/confirmation.js` (170 lines)
+- `/static/js/editor.js` (420 lines)
+- `/static/js/file-tree-actions.js` (482 lines)
+- `/static/js/file-tree.js` (865 lines)
+- `/static/js/macro-parser.js` (103 lines)
+- `/static/js/macro-processor.js` (157 lines)
+- `/static/js/ui-utils.js` (305 lines)
+- `/static/js/webdav-client.js` (266 lines)
+
+**CSS Files (6):**
+
+- `/static/css/variables.css` (32 lines)
+- `/static/css/layout.css`
+- `/static/css/file-tree.css`
+- `/static/css/editor.css`
+- `/static/css/components.css`
+- `/static/css/modal.css`
+
+**HTML Templates (1):**
+
+- `/templates/index.html` (203 lines)
+
+---
+
+## Issues Found
+
+### 🔴 HIGH PRIORITY
+
+1. **Deprecated Modal Code (Dead Code)**
+   - Location: `/static/js/file-tree-actions.js` lines 262-474
+   - Impact: 213 lines of unused code (44% of file)
+   - Risk: LOW to remove
+
+2. **Duplicated Event Bus Implementation**
+   - Location: `/static/js/app.js` lines 16-30
+   - Should be extracted to reusable module
+
+3. **Duplicated Debounce Function**
+   - Location: `/static/js/editor.js` lines 404-414
+   - Should be shared utility
+
+4. **Inconsistent Notification Usage**
+   - Mixed usage of `window.showNotification` vs `showNotification`
+
+5. **Duplicated File Download Logic**
+   - Location: `/static/js/file-tree.js` lines 829-839
+   - Should be shared utility
+
+6. **Hard-coded Values**
+   - Long-press threshold: 400ms
+   - Debounce delay: 300ms
+   - Drag preview width: 200px
+   - Toast delay: 3000ms
+
+### 🟡 MEDIUM PRIORITY
+
+7. **Global State Management**
+   - Location: `/static/js/app.js` lines 6-13
+   - Makes testing difficult
+
+8. **Duplicated Path Manipulation**
+   - `path.split('/').pop()` appears 10+ times
+   - `path.substring(0, path.lastIndexOf('/'))` appears 5+ times
+
+9. **Mixed Responsibility in ui-utils.js**
+   - Contains 6 different classes/utilities
+   - Should be split into separate modules
+
+10. **Deprecated Event Handler**
+    - Location: `/static/js/file-tree-actions.js` line 329
+    - Uses deprecated `onkeypress`
+
+### 🟢 LOW PRIORITY
+
+11. **Unused Function Parameters**
+12. **Magic Numbers in Styling**
+13. **Inconsistent Comment Styles**
+14. **Console.log Statements**
+
+---
+
+## Phase 2: Proposed Reusable Components
+
+### 1. Config Module (`/static/js/config.js`)
+
+Centralize all configuration values:
+
+```javascript
+export const Config = {
+    // Timing
+    LONG_PRESS_THRESHOLD: 400,
+    DEBOUNCE_DELAY: 300,
+    TOAST_DURATION: 3000,
+    
+    // UI
+    DRAG_PREVIEW_WIDTH: 200,
+    TREE_INDENT_PX: 12,
+    MOUSE_MOVE_THRESHOLD: 5,
+    
+    // Validation
+    FILENAME_PATTERN: /^[a-z0-9_]+(\.[a-z0-9_]+)*$/,
+    
+    // Storage Keys
+    STORAGE_KEYS: {
+        DARK_MODE: 'darkMode',
+        SELECTED_COLLECTION: 'selectedCollection',
+        LAST_VIEWED_PAGE: 'lastViewedPage',
+        COLUMN_DIMENSIONS: 'columnDimensions'
+    }
+};
+```
+
+### 2. Logger Module (`/static/js/logger.js`)
+
+Structured logging with levels:
+
+```javascript
+export class Logger {
+    static debug(message, ...args)
+    static info(message, ...args)
+    static warn(message, ...args)
+    static error(message, ...args)
+    static setLevel(level)
+}
+```
+
+### 3. Event Bus Module (`/static/js/event-bus.js`)
+
+Centralized event system:
+
+```javascript
+export class EventBus {
+    on(event, callback)
+    off(event, callback)
+    once(event, callback)
+    dispatch(event, data)
+    clear(event)
+}
+```
+
+### 4. Utilities Module (`/static/js/utils.js`)
+
+Common utility functions:
+
+```javascript
+export const PathUtils = {
+    getFileName(path),
+    getParentPath(path),
+    normalizePath(path),
+    joinPaths(...paths),
+    getExtension(path)
+};
+
+export const TimingUtils = {
+    debounce(func, wait),
+    throttle(func, wait)
+};
+
+export const DownloadUtils = {
+    triggerDownload(content, filename),
+    downloadAsBlob(blob, filename)
+};
+
+export const ValidationUtils = {
+    validateFileName(name, isFolder),
+    sanitizeFileName(name)
+};
+```
+
+### 5. Notification Service (`/static/js/notification-service.js`)
+
+Standardized notifications:
+
+```javascript
+export class NotificationService {
+    static success(message)
+    static error(message)
+    static warning(message)
+    static info(message)
+}
+```
+
+---
+
+## Phase 3: Refactoring Tasks
+
+### 🔴 HIGH PRIORITY
+
+**Task 1: Remove Dead Code**
+
+- Files: `/static/js/file-tree-actions.js`
+- Lines: 262-474 (213 lines)
+- Risk: LOW
+- Dependencies: None
+
+**Task 2: Extract Event Bus**
+
+- Files: NEW `/static/js/event-bus.js`, MODIFY `app.js`, `editor.js`
+- Risk: MEDIUM
+- Dependencies: None
+
+**Task 3: Create Utilities Module**
+
+- Files: NEW `/static/js/utils.js`, MODIFY multiple files
+- Risk: MEDIUM
+- Dependencies: None
+
+**Task 4: Create Config Module**
+
+- Files: NEW `/static/js/config.js`, MODIFY multiple files
+- Risk: LOW
+- Dependencies: None
+
+**Task 5: Standardize Notification Usage**
+
+- Files: NEW `/static/js/notification-service.js`, MODIFY multiple files
+- Risk: LOW
+- Dependencies: None
+
+### 🟡 MEDIUM PRIORITY
+
+**Task 6: Fix Deprecated Event Handler**
+
+- Files: `/static/js/file-tree-actions.js` line 329
+- Risk: LOW
+- Dependencies: None
+
+**Task 7: Refactor ui-utils.js**
+
+- Files: DELETE `ui-utils.js`, CREATE 5 new modules
+- Risk: HIGH
+- Dependencies: Task 5
+
+**Task 8: Standardize Class Export Pattern**
+
+- Files: All class files
+- Risk: MEDIUM
+- Dependencies: None
+
+**Task 9: Create Logger Module**
+
+- Files: NEW `/static/js/logger.js`, MODIFY multiple files
+- Risk: LOW
+- Dependencies: None
+
+**Task 10: Implement Download Action**
+
+- Files: `/static/js/file-tree-actions.js`
+- Risk: LOW
+- Dependencies: Task 3
+
+### 🟢 LOW PRIORITY
+
+**Task 11: Standardize JSDoc Comments**
+**Task 12: Extract Magic Numbers to CSS**
+**Task 13: Add Error Boundaries**
+**Task 14: Cache DOM Elements**
+
+---
+
+## Phase 4: Implementation Order
+
+### Step 1: Foundation (Do First)
+
+1. Create Config Module (Task 4)
+2. Create Logger Module (Task 9)
+3. Create Event Bus Module (Task 2)
+
+### Step 2: Utilities (Do Second)
+
+4. Create Utilities Module (Task 3)
+5. Create Notification Service (Task 5)
+
+### Step 3: Cleanup (Do Third)
+
+6. Remove Dead Code (Task 1)
+7. Fix Deprecated Event Handler (Task 6)
+
+### Step 4: Restructuring (Do Fourth)
+
+8. Refactor ui-utils.js (Task 7)
+9. Standardize Class Export Pattern (Task 8)
+
+### Step 5: Enhancements (Do Fifth)
+
+10. Implement Download Action (Task 10)
+11. Add Error Boundaries (Task 13)
+
+### Step 6: Polish (Do Last)
+
+12. Standardize JSDoc Comments (Task 11)
+13. Extract Magic Numbers to CSS (Task 12)
+14. Cache DOM Elements (Task 14)
+
+---
+
+## Phase 5: Testing Checklist
+
+### Core Functionality
+
+- [ ] File tree loads and displays correctly
+- [ ] Files can be selected and opened
+- [ ] Folders can be expanded/collapsed
+- [ ] Editor loads file content
+- [ ] Preview renders markdown correctly
+- [ ] Save button saves files
+- [ ] Delete button deletes files
+- [ ] New button creates new files
+
+### Context Menu Actions
+
+- [ ] Right-click shows context menu
+- [ ] New file action works
+- [ ] New folder action works
+- [ ] Rename action works
+- [ ] Delete action works
+- [ ] Copy/Cut/Paste actions work
+- [ ] Upload action works
+
+### Drag and Drop
+
+- [ ] Long-press detection works
+- [ ] Drag preview appears correctly
+- [ ] Drop targets highlight properly
+- [ ] Files can be moved
+- [ ] Undo (Ctrl+Z) works
+
+### Modals
+
+- [ ] Confirmation modals appear
+- [ ] Prompt modals appear
+- [ ] Modals don't double-open
+- [ ] Enter/Escape keys work
+
+### UI Features
+
+- [ ] Dark mode toggle works
+- [ ] Collection selector works
+- [ ] Column resizers work
+- [ ] Notifications appear
+- [ ] URL routing works
+- [ ] View/Edit modes work
+
+---
+
+## Recommendations
+
+### Immediate Actions (Before Production)
+
+1. Remove dead code (Task 1)
+2. Fix deprecated event handler (Task 6)
+3. Create config module (Task 4)
+
+### Short-term Actions (Next Sprint)
+
+4. Extract utilities (Task 3)
+5. Standardize notifications (Task 5)
+6. Create event bus (Task 2)
+
+### Medium-term Actions (Future Sprints)
+
+7. Refactor ui-utils.js (Task 7)
+8. Add logger (Task 9)
+9. Standardize exports (Task 8)
+
+---
+
+## Success Metrics
+
+**Before Refactoring:**
+
+- Total Lines: ~3,587
+- Dead Code: 213 lines (6%)
+- Duplicated Code: ~50 lines
+- Hard-coded Values: 15+
+
+**After Refactoring:**
+
+- Total Lines: ~3,400 (-5%)
+- Dead Code: 0 lines
+- Duplicated Code: 0 lines
+- Hard-coded Values: 0
+
+**Estimated Effort:** 5-8 days
+
+---
+
+## Conclusion
+
+The UI codebase is generally well-structured. Main improvements needed:
+
+1. Remove dead code
+2. Extract duplicated utilities
+3. Centralize configuration
+4. Standardize patterns
+
+Start with high-impact, low-risk changes first to ensure production readiness.

server_debug.log

@@ -0,0 +1,8 @@
+==============================================
+Markdown Editor v3.0 - WebDAV Server
+==============================================
+Activating virtual environment...
+Installing dependencies...
+Audited 3 packages in 29ms
+Checking for process on port 8004...
+Starting WebDAV server...

server_webdav.py

@@ -28,9 +28,17 @@ class MarkdownEditorApp:
     
     def load_config(self, config_path):
         """Load configuration from YAML file"""
+        self.config_path = config_path
         with open(config_path, 'r') as f:
             return yaml.safe_load(f)
 
+    def save_config(self):
+        """Save configuration to YAML file"""
+        # Update config with current collections
+        self.config['collections'] = self.collections
+        with open(self.config_path, 'w') as f:
+            yaml.dump(self.config, f, default_flow_style=False, sort_keys=False)
+    
     def setup_collections(self):
         """Create collection directories if they don't exist"""
         for name, config in self.collections.items():
@@ -92,13 +100,30 @@ class MarkdownEditorApp:
         if path == '/fs/' and method == 'GET':
             return self.handle_collections_list(environ, start_response)
 
+        # API to create new collection
+        if path == '/fs/' and method == 'POST':
+            return self.handle_create_collection(environ, start_response)
+
+        # API to delete a collection
+        if path.startswith('/api/collections/') and method == 'DELETE':
+            return self.handle_delete_collection(environ, start_response)
+
+        # Check if path starts with a collection name (for SPA routing)
+        # This handles URLs like /notes/ttt or /documents/file.md
+        # MUST be checked BEFORE WebDAV routing to prevent WebDAV from intercepting SPA routes
+        path_parts = path.strip('/').split('/')
+        if path_parts and path_parts[0] in self.collections:
+            # This is a SPA route for a collection, serve index.html
+            # The client-side router will handle the path
+            return self.handle_index(environ, start_response)
+
         # All other /fs/ requests go to WebDAV
         if path.startswith('/fs/'):
             return self.webdav_app(environ, start_response)
 
-        # Fallback for anything else (shouldn't happen with correct linking)
-        start_response('404 Not Found', [('Content-Type', 'text/plain')])
-        return [b'Not Found']
+        # Fallback: Serve index.html for all other routes (SPA routing)
+        # This allows client-side routing to handle any other paths
+        return self.handle_index(environ, start_response)
     
     def handle_collections_list(self, environ, start_response):
         """Return list of available collections"""
@@ -113,6 +138,139 @@ class MarkdownEditorApp:
 
         return [response_body]
 
+    def handle_create_collection(self, environ, start_response):
+        """Create a new collection"""
+        try:
+            # Read request body
+            content_length = int(environ.get('CONTENT_LENGTH', 0))
+            request_body = environ['wsgi.input'].read(content_length)
+            data = json.loads(request_body.decode('utf-8'))
+
+            collection_name = data.get('name')
+            if not collection_name:
+                start_response('400 Bad Request', [('Content-Type', 'application/json')])
+                return [json.dumps({'error': 'Collection name is required'}).encode('utf-8')]
+
+            # Check if collection already exists
+            if collection_name in self.collections:
+                start_response('409 Conflict', [('Content-Type', 'application/json')])
+                return [json.dumps({'error': f'Collection "{collection_name}" already exists'}).encode('utf-8')]
+
+            # Create collection directory
+            collection_path = Path(f'./collections/{collection_name}')
+            collection_path.mkdir(parents=True, exist_ok=True)
+
+            # Create images subdirectory
+            images_path = collection_path / 'images'
+            images_path.mkdir(exist_ok=True)
+
+            # Add to collections dict
+            self.collections[collection_name] = {
+                'path': str(collection_path),
+                'description': f'User-created collection: {collection_name}'
+            }
+
+            # Update config file
+            self.save_config()
+
+            # Add to WebDAV provider mapping
+            from wsgidav.fs_dav_provider import FilesystemProvider
+            provider_path = os.path.abspath(str(collection_path))
+            provider_key = f'/fs/{collection_name}'
+
+            # Use the add_provider method if available, otherwise add directly to provider_map
+            provider = FilesystemProvider(provider_path)
+            if hasattr(self.webdav_app, 'add_provider'):
+                self.webdav_app.add_provider(provider_key, provider)
+                print(f"Added provider using add_provider(): {provider_key}")
+            else:
+                self.webdav_app.provider_map[provider_key] = provider
+                print(f"Added provider to provider_map: {provider_key}")
+
+            # Also update sorted_share_list if it exists
+            if hasattr(self.webdav_app, 'sorted_share_list'):
+                if provider_key not in self.webdav_app.sorted_share_list:
+                    self.webdav_app.sorted_share_list.append(provider_key)
+                    self.webdav_app.sorted_share_list.sort(reverse=True)
+                    print(f"Updated sorted_share_list")
+
+            print(f"Created collection '{collection_name}' at {provider_path}")
+
+            response_body = json.dumps({'success': True, 'name': collection_name}).encode('utf-8')
+            start_response('201 Created', [
+                ('Content-Type', 'application/json'),
+                ('Content-Length', str(len(response_body))),
+                ('Access-Control-Allow-Origin', '*')
+            ])
+
+            return [response_body]
+
+        except Exception as e:
+            print(f"Error creating collection: {e}")
+            start_response('500 Internal Server Error', [('Content-Type', 'application/json')])
+            return [json.dumps({'error': str(e)}).encode('utf-8')]
+
+    def handle_delete_collection(self, environ, start_response):
+        """Delete a collection"""
+        try:
+            # Extract collection name from path: /api/collections/{name}
+            path = environ.get('PATH_INFO', '')
+            collection_name = path.split('/')[-1]
+
+            if not collection_name:
+                start_response('400 Bad Request', [('Content-Type', 'application/json')])
+                return [json.dumps({'error': 'Collection name is required'}).encode('utf-8')]
+
+            # Check if collection exists
+            if collection_name not in self.collections:
+                start_response('404 Not Found', [('Content-Type', 'application/json')])
+                return [json.dumps({'error': f'Collection "{collection_name}" not found'}).encode('utf-8')]
+
+            # Get collection path
+            collection_config = self.collections[collection_name]
+            collection_path = Path(collection_config['path'])
+
+            # Delete the collection directory and all its contents
+            import shutil
+            if collection_path.exists():
+                shutil.rmtree(collection_path)
+                print(f"Deleted collection directory: {collection_path}")
+
+            # Remove from collections dict
+            del self.collections[collection_name]
+
+            # Update config file
+            self.save_config()
+
+            # Remove from WebDAV provider mapping
+            provider_key = f'/fs/{collection_name}'
+            if hasattr(self.webdav_app, 'provider_map') and provider_key in self.webdav_app.provider_map:
+                del self.webdav_app.provider_map[provider_key]
+                print(f"Removed provider from provider_map: {provider_key}")
+
+            # Remove from sorted_share_list if it exists
+            if hasattr(self.webdav_app, 'sorted_share_list') and provider_key in self.webdav_app.sorted_share_list:
+                self.webdav_app.sorted_share_list.remove(provider_key)
+                print(f"Removed from sorted_share_list: {provider_key}")
+
+            print(f"Deleted collection '{collection_name}'")
+
+            response_body = json.dumps({'success': True, 'name': collection_name}).encode('utf-8')
+            start_response('200 OK', [
+                ('Content-Type', 'application/json'),
+                ('Content-Length', str(len(response_body))),
+                ('Access-Control-Allow-Origin', '*')
+            ])
+
+            return [response_body]
+
+        except Exception as e:
+            print(f"Error deleting collection: {e}")
+            import traceback
+            traceback.print_exc()
+            start_response('500 Internal Server Error', [('Content-Type', 'application/json')])
+            return [json.dumps({'error': str(e)}).encode('utf-8')]
+
     def handle_static(self, environ, start_response):
         """Serve static files"""
         path = environ.get('PATH_INFO', '')[1:]  # Remove leading /

static/app-tree.js

@@ -1,5 +1,5 @@
 // Markdown Editor Application with File Tree
-(function() {
+(function () {
     'use strict';
 
     // State management
@@ -24,7 +24,7 @@
     function enableDarkMode() {
         isDarkMode = true;
         document.body.classList.add('dark-mode');
-        document.getElementById('darkModeIcon').textContent = '☀️';
+        document.getElementById('darkModeIcon').innerHTML = '<i class="bi bi-sun-fill"></i>';
         localStorage.setItem('darkMode', 'true');
 
         mermaid.initialize({
@@ -41,7 +41,7 @@
     function disableDarkMode() {
         isDarkMode = false;
         document.body.classList.remove('dark-mode');
-        document.getElementById('darkModeIcon').textContent = '🌙';
+        // document.getElementById('darkModeIcon').textContent = '🌙';
         localStorage.setItem('darkMode', 'false');
 
         mermaid.initialize({
@@ -189,8 +189,8 @@
             lineWrapping: true,
             autofocus: true,
             extraKeys: {
-                'Ctrl-S': function() { saveFile(); },
-                'Cmd-S': function() { saveFile(); }
+                'Ctrl-S': function () { saveFile(); },
+                'Cmd-S': function () { saveFile(); }
             }
         });
 
@@ -338,7 +338,6 @@
         if (node.type === 'directory') {
             const toggle = document.createElement('span');
             toggle.className = 'tree-node-toggle';
-            toggle.innerHTML = '▶';
             toggle.addEventListener('click', (e) => {
                 e.stopPropagation();
                 toggleNode(nodeDiv);

static/app.js

@@ -1,5 +1,5 @@
 // Markdown Editor Application
-(function() {
+(function () {
     'use strict';
 
     // State management
@@ -21,7 +21,7 @@
     function enableDarkMode() {
         isDarkMode = true;
         document.body.classList.add('dark-mode');
-        document.getElementById('darkModeIcon').textContent = '☀️';
+        document.getElementById('darkModeIcon').innerHTML = '<i class="bi bi-sun-fill"></i>';
         localStorage.setItem('darkMode', 'true');
 
         // Update mermaid theme
@@ -40,7 +40,7 @@
     function disableDarkMode() {
         isDarkMode = false;
         document.body.classList.remove('dark-mode');
-        document.getElementById('darkModeIcon').textContent = '🌙';
+        // document.getElementById('darkModeIcon').textContent = '🌙';
         localStorage.setItem('darkMode', 'false');
 
         // Update mermaid theme
@@ -198,8 +198,8 @@
             lineWrapping: true,
             autofocus: true,
             extraKeys: {
-                'Ctrl-S': function() { saveFile(); },
-                'Cmd-S': function() { saveFile(); }
+                'Ctrl-S': function () { saveFile(); },
+                'Cmd-S': function () { saveFile(); }
             }
         });
 

static/css/components.css

@@ -2,10 +2,21 @@
 .preview-pane {
     font-size: 16px;
     line-height: 1.6;
+    color: var(--text-primary);
+    background-color: var(--bg-primary);
 }
 
-.preview-pane h1, .preview-pane h2, .preview-pane h3,
-.preview-pane h4, .preview-pane h5, .preview-pane h6 {
+#preview {
+    color: var(--text-primary);
+    background-color: var(--bg-primary);
+}
+
+.preview-pane h1,
+.preview-pane h2,
+.preview-pane h3,
+.preview-pane h4,
+.preview-pane h5,
+.preview-pane h6 {
     margin-top: 24px;
     margin-bottom: 16px;
     font-weight: 600;
@@ -132,11 +143,21 @@ body.dark-mode .context-menu {
     animation: slideIn 0.3s ease;
 }
 
+/* Override Bootstrap warning background to be darker for better text contrast */
+.toast.bg-warning {
+    background-color: #cc9a06 !important;
+}
+
+body.dark-mode .toast.bg-warning {
+    background-color: #b8860b !important;
+}
+
 @keyframes slideIn {
     from {
         transform: translateX(400px);
         opacity: 0;
     }
+
     to {
         transform: translateX(0);
         opacity: 1;
@@ -152,6 +173,7 @@ body.dark-mode .context-menu {
         transform: translateX(0);
         opacity: 1;
     }
+
     to {
         transform: translateX(400px);
         opacity: 0;
@@ -206,3 +228,226 @@ body.dark-mode .modal-footer {
     border-color: var(--link-color);
     box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
 }
+
+/* Directory Preview Styles */
+.directory-preview {
+    padding: 20px;
+}
+
+.directory-preview h2 {
+    margin-bottom: 20px;
+    /* color: var(--text-primary); */
+}
+
+.directory-files {
+    display: grid;
+    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
+    gap: 16px;
+    margin-top: 20px;
+}
+
+.file-card {
+    background-color: var(--bg-tertiary);
+    border: 1px solid var(--border-color);
+    border-radius: 8px;
+    padding: 16px;
+    cursor: pointer;
+    transition: all 0.2s ease;
+}
+
+.file-card:hover {
+    background-color: var(--bg-secondary);
+    border-color: var(--link-color);
+    transform: translateY(-2px);
+    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
+}
+
+.file-card-header {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    margin-bottom: 8px;
+}
+
+.file-card-header i {
+    color: var(--link-color);
+    font-size: 18px;
+}
+
+.file-card-name {
+    font-weight: 500;
+    color: var(--text-primary);
+    word-break: break-word;
+}
+
+.file-card-description {
+    font-size: 13px;
+    color: var(--text-secondary);
+    line-height: 1.4;
+    margin-top: 8px;
+}
+
+/* Flat Button Styles */
+.btn-flat {
+    border: none;
+    border-radius: 0;
+    padding: 6px 12px;
+    font-size: 14px;
+    font-weight: 500;
+    transition: all 0.2s ease;
+    background-color: transparent;
+    color: var(--text-primary);
+    position: relative;
+}
+
+.btn-flat:hover {
+    background-color: var(--bg-tertiary);
+}
+
+.btn-flat:active {
+    transform: scale(0.95);
+}
+
+/* Flat button variants */
+.btn-flat-primary {
+    color: #0d6efd;
+}
+
+.btn-flat-primary:hover {
+    background-color: rgba(13, 110, 253, 0.1);
+}
+
+.btn-flat-success {
+    color: #198754;
+}
+
+.btn-flat-success:hover {
+    background-color: rgba(25, 135, 84, 0.1);
+}
+
+.btn-flat-danger {
+    color: #dc3545;
+}
+
+.btn-flat-danger:hover {
+    background-color: rgba(220, 53, 69, 0.1);
+}
+
+.btn-flat-warning {
+    color: #ffc107;
+}
+
+.btn-flat-warning:hover {
+    background-color: rgba(255, 193, 7, 0.1);
+}
+
+.btn-flat-secondary {
+    color: var(--text-secondary);
+}
+
+.btn-flat-secondary:hover {
+    background-color: var(--bg-tertiary);
+}
+
+/* Dark mode adjustments */
+body.dark-mode .btn-flat-primary {
+    color: #6ea8fe;
+}
+
+body.dark-mode .btn-flat-success {
+    color: #75b798;
+}
+
+body.dark-mode .btn-flat-danger {
+    color: #ea868f;
+}
+
+body.dark-mode .btn-flat-warning {
+    color: #ffda6a;
+}
+
+/* Dark Mode Button Icon Styles */
+#darkModeBtn i {
+    font-size: 16px;
+    color: inherit;
+    /* Inherit color from parent button */
+}
+
+/* Light mode: moon icon */
+body:not(.dark-mode) #darkModeBtn i {
+    color: var(--text-secondary);
+}
+
+/* Dark mode: sun icon */
+body.dark-mode #darkModeBtn i {
+    color: #ffc107;
+    /* Warm sun color */
+}
+
+/* Hover effects */
+#darkModeBtn:hover i {
+    color: inherit;
+    /* Inherit hover color from parent */
+}
+
+/* ===================================
+   Loading Spinner Component
+   =================================== */
+
+/* Loading overlay - covers the target container */
+.loading-overlay {
+    position: absolute;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    background: var(--bg-primary);
+    opacity: 0.95;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    z-index: 1000;
+    transition: opacity 0.2s ease;
+}
+
+/* Loading spinner */
+.loading-spinner {
+    width: 48px;
+    height: 48px;
+    border: 4px solid var(--border-color);
+    border-top-color: var(--primary-color);
+    border-radius: 50%;
+    animation: spin 0.8s linear infinite;
+}
+
+/* Spinner animation */
+@keyframes spin {
+    to {
+        transform: rotate(360deg);
+    }
+}
+
+/* Loading text */
+.loading-text {
+    margin-top: 16px;
+    color: var(--text-secondary);
+    font-size: 14px;
+    text-align: center;
+}
+
+/* Loading container with spinner and text */
+.loading-content {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    gap: 12px;
+}
+
+/* Hide loading overlay by default */
+.loading-overlay.hidden {
+    display: none;
+}
+
+.language-bash {
+    color: var(--text-primary) !important;
+}

static/css/editor.css

@@ -6,6 +6,8 @@
     display: flex;
     gap: 10px;
     align-items: center;
+    flex-shrink: 0;
+    /* Prevent header from shrinking */
 }
 
 .editor-header input {
@@ -19,18 +21,42 @@
 
 .editor-container {
     flex: 1;
+    /* Take remaining space */
     overflow: hidden;
+    /* Prevent container overflow, CodeMirror handles its own scrolling */
+    display: flex;
+    flex-direction: column;
+    min-height: 0;
+    /* Important: allows flex child to shrink below content size */
+    position: relative;
+}
+
+#editor {
+    flex: 1;
+    /* Take all available space */
+    min-height: 0;
+    /* Allow shrinking */
+    overflow: hidden;
+    /* CodeMirror will handle scrolling */
 }
 
 /* CodeMirror customization */
 .CodeMirror {
-    height: 100%;
+    height: 100% !important;
+    /* Force full height */
     font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
     font-size: 14px;
     background-color: var(--bg-primary);
     color: var(--text-primary);
 }
 
+.CodeMirror-scroll {
+    overflow-y: auto !important;
+    /* Ensure vertical scrolling is enabled */
+    overflow-x: auto !important;
+    /* Ensure horizontal scrolling is enabled */
+}
+
 body.dark-mode .CodeMirror {
     background-color: #1c2128;
     color: #e6edf3;
@@ -72,4 +98,3 @@ body.dark-mode .CodeMirror-gutters {
     pointer-events: none;
     z-index: 1000;
 }
-

static/css/file-tree.css

@@ -20,8 +20,9 @@
     color: var(--text-primary);
     transition: all 0.15s ease;
     white-space: nowrap;
-    overflow: hidden;
+    overflow: visible;
     text-overflow: ellipsis;
+    min-height: 28px;
 }
 
 .tree-node:hover {
@@ -29,14 +30,16 @@
 }
 
 .tree-node.active {
-    background-color: var(--link-color);
-    color: white;
+    color: var(--link-color);
     font-weight: 500;
 }
 
 .tree-node.active:hover {
-    background-color: var(--link-color);
-    filter: brightness(1.1);
+    filter: brightness(1.2);
+}
+
+.tree-node.active .tree-node-icon {
+    color: var(--link-color);
 }
 
 /* Toggle arrow */
@@ -46,16 +49,25 @@
     justify-content: center;
     width: 16px;
     height: 16px;
-    font-size: 10px;
+    min-width: 16px;
+    min-height: 16px;
     color: var(--text-secondary);
     flex-shrink: 0;
     transition: transform 0.2s ease;
+    position: relative;
+    z-index: 1;
+    overflow: visible;
+    cursor: pointer;
 }
 
 .tree-node-toggle.expanded {
     transform: rotate(90deg);
 }
 
+.tree-node-toggle:hover {
+    color: var(--link-color);
+}
+
 /* Icon styling */
 .tree-node-icon {
     width: 16px;
@@ -67,10 +79,6 @@
     color: var(--text-secondary);
 }
 
-.tree-node.active .tree-node-icon {
-    color: white;
-}
-
 /* Content wrapper */
 .tree-node-content {
     display: flex;
@@ -112,13 +120,54 @@
 }
 
 /* Drag and drop */
+/* Default cursor is pointer, not grab (only show grab after long-press) */
+.tree-node {
+    cursor: pointer;
+}
+
+/* Show grab cursor only when drag is ready (after long-press) */
+.tree-node.drag-ready {
+    cursor: grab !important;
+}
+
+.tree-node.drag-ready:active {
+    cursor: grabbing !important;
+}
+
 .tree-node.dragging {
-    opacity: 0.5;
+    opacity: 0.4;
+    background-color: var(--bg-tertiary);
+    cursor: grabbing !important;
 }
 
 .tree-node.drag-over {
-    background-color: rgba(13, 110, 253, 0.2);
-    border: 1px dashed var(--link-color);
+    background-color: rgba(13, 110, 253, 0.15) !important;
+    border: 2px dashed var(--link-color) !important;
+    box-shadow: 0 0 8px rgba(13, 110, 253, 0.3);
+}
+
+/* Root-level drop target highlighting */
+.file-tree.drag-over-root {
+    background-color: rgba(13, 110, 253, 0.08);
+    border: 2px dashed var(--link-color);
+    border-radius: 6px;
+    box-shadow: inset 0 0 12px rgba(13, 110, 253, 0.2);
+    margin: 4px;
+    padding: 4px;
+}
+
+/* Only show drag cursor on directories when dragging */
+body.dragging-active .tree-node[data-isdir="true"] {
+    cursor: copy;
+}
+
+body.dragging-active .tree-node[data-isdir="false"] {
+    cursor: no-drop;
+}
+
+/* Show move cursor when hovering over root-level empty space */
+body.dragging-active .file-tree.drag-over-root {
+    cursor: move;
 }
 
 /* Collection selector - Bootstrap styled */
@@ -156,13 +205,34 @@ body.dark-mode .tree-node:hover {
 }
 
 body.dark-mode .tree-node.active {
-    background-color: var(--link-color);
+    color: var(--link-color);
+}
+
+body.dark-mode .tree-node.active .tree-node-icon {
+    color: var(--link-color);
+}
+
+body.dark-mode .tree-node.active .tree-node-icon .tree-node-toggle {
+    color: var(--link-color);
 }
 
 body.dark-mode .tree-children {
     border-left-color: var(--border-color);
 }
 
+/* Empty directory message */
+.tree-empty-message {
+    padding: 8px 12px;
+    color: var(--text-secondary);
+    font-size: 12px;
+    font-style: italic;
+    user-select: none;
+}
+
+body.dark-mode .tree-empty-message {
+    color: var(--text-secondary);
+}
+
 /* Scrollbar in sidebar */
 .sidebar::-webkit-scrollbar-thumb {
     background-color: var(--border-color);
@@ -171,3 +241,13 @@ body.dark-mode .tree-children {
 .sidebar::-webkit-scrollbar-thumb:hover {
     background-color: var(--text-secondary);
 }
+
+.new-collection-btn {
+    padding: 0.375rem 0.75rem;
+    font-size: 1rem;
+    border-radius: 0.25rem;
+    transition: all 0.2s ease;
+    color: var(--text-primary);
+    border: 1px solid var(--border-color);
+    background-color: transparent;
+}

static/css/layout.css

@@ -1,14 +1,22 @@
 /* Base layout styles */
-html, body {
-    height: 100%;
+html,
+body {
+    height: 100vh;
     margin: 0;
     padding: 0;
+    overflow: hidden;
+    /* Prevent page-level scrolling */
     font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
     background-color: var(--bg-primary);
     color: var(--text-primary);
     transition: background-color 0.3s ease, color 0.3s ease;
 }
 
+body {
+    display: flex;
+    flex-direction: column;
+}
+
 /* Column Resizer */
 .column-resizer {
     width: 1px;
@@ -17,14 +25,21 @@ html, body {
     transition: background-color 0.2s ease, width 0.2s ease, box-shadow 0.2s ease;
     user-select: none;
     flex-shrink: 0;
-    padding: 0 3px;  /* Add invisible padding for easier grab */
-    margin: 0 -3px;  /* Compensate for padding */
+    padding: 0 3px;
+    /* Add invisible padding for easier grab */
+    margin: 0 -3px;
+    /* Compensate for padding */
+    height: 100%;
+    /* Take full height of parent */
+    align-self: stretch;
+    /* Ensure it stretches to full height */
 }
 
 .column-resizer:hover {
     background-color: var(--link-color);
     width: 1px;
-    box-shadow: 0 0 6px rgba(13, 110, 253, 0.3);  /* Visual feedback instead of width change */
+    box-shadow: 0 0 6px rgba(13, 110, 253, 0.3);
+    /* Visual feedback instead of width change */
 }
 
 .column-resizer.dragging {
@@ -36,12 +51,59 @@ html, body {
     background-color: var(--link-color);
 }
 
-/* Adjust container for flex layout */
-.container-fluid {
+/* Navbar */
+.navbar {
+    background-color: var(--bg-secondary);
+    border-bottom: 1px solid var(--border-color);
+    transition: background-color 0.3s ease;
+    flex-shrink: 0;
+    /* Prevent navbar from shrinking */
+    padding: 0.5rem 1rem;
+}
+
+.navbar .container-fluid {
     display: flex;
     flex-direction: row;
-    height: calc(100% - 56px);
+    align-items: center;
+    justify-content: space-between;
     padding: 0;
+    overflow: visible;
+    /* Override the hidden overflow for navbar */
+}
+
+.navbar-brand {
+    color: var(--text-primary) !important;
+    font-weight: 600;
+    font-size: 1.1rem;
+    margin: 0;
+    flex-shrink: 0;
+}
+
+.navbar-brand i {
+    font-size: 1.2rem;
+    margin-right: 0.5rem;
+}
+
+.navbar-center {
+    flex: 1;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+}
+
+.navbar-right {
+    flex-shrink: 0;
+}
+
+/* Adjust container for flex layout */
+.container-fluid {
+    flex: 1;
+    /* Take remaining space after navbar */
+    padding: 0;
+    overflow: hidden;
+    /* Prevent container scrolling */
+    display: flex;
+    flex-direction: column;
 }
 
 .row {
@@ -50,13 +112,75 @@ html, body {
     flex-direction: row;
     margin: 0;
     height: 100%;
+    overflow: hidden;
+    /* Prevent row scrolling */
 }
 
 #sidebarPane {
     flex: 0 0 20%;
     min-width: 150px;
-    max-width: 40%;
+    max-width: 20%;
     padding: 0;
+    height: 100%;
+    overflow: hidden;
+    /* Prevent pane scrolling */
+    transition: flex 0.3s ease, min-width 0.3s ease, max-width 0.3s ease;
+}
+
+/* Collapsed sidebar state - mini sidebar */
+#sidebarPane.collapsed {
+    flex: 0 0 50px;
+    min-width: 50px;
+    max-width: 50px;
+    border-right: 1px solid var(--border-color);
+    position: relative;
+    cursor: pointer;
+}
+
+/* Hide file tree content when collapsed */
+#sidebarPane.collapsed #fileTree {
+    display: none;
+}
+
+/* Hide collection selector when collapsed */
+#sidebarPane.collapsed .collection-selector {
+    display: none;
+}
+
+/* Visual indicator in the mini sidebar */
+#sidebarPane.collapsed::before {
+    content: '';
+    display: block;
+    width: 100%;
+    height: 100%;
+    background: var(--bg-secondary);
+    transition: background 0.2s ease;
+}
+
+/* Hover effect on mini sidebar */
+#sidebarPane.collapsed:hover::before {
+    background: var(--hover-bg);
+}
+
+/* Right arrow icon in the center of mini sidebar */
+#sidebarPane.collapsed::after {
+    content: '\F285';
+    /* Bootstrap icon chevron-right */
+    font-family: 'bootstrap-icons';
+    position: absolute;
+    top: 50%;
+    left: 50%;
+    transform: translate(-50%, -50%);
+    font-size: 20px;
+    color: var(--text-secondary);
+    pointer-events: none;
+    opacity: 0.5;
+    transition: opacity 0.2s ease;
+    cursor: pointer;
+}
+
+#sidebarPane.collapsed:hover::after {
+    opacity: 1;
 }
 
 #editorPane {
@@ -64,25 +188,23 @@ html, body {
     min-width: 250px;
     max-width: 70%;
     padding: 0;
-}
-
-#previewPane {
-    flex: 1 1 40%;
-    min-width: 250px;
-    max-width: 70%;
-    padding: 0;
+    display: flex;
+    flex-direction: column;
+    height: 100%;
+    overflow: hidden;
+    /* Prevent pane scrolling */
 }
 
 /* Sidebar - improved */
 .sidebar {
     background-color: var(--bg-secondary);
     border-right: 1px solid var(--border-color);
-    overflow-y: auto;
-    overflow-x: hidden;
     height: 100%;
     transition: background-color 0.3s ease;
     display: flex;
     flex-direction: column;
+    overflow: hidden;
+    /* Prevent sidebar container scrolling */
 }
 
 .sidebar h6 {
@@ -92,25 +214,27 @@ html, body {
     color: var(--text-secondary);
     text-transform: uppercase;
     letter-spacing: 0.5px;
+    flex-shrink: 0;
+    /* Prevent header from shrinking */
+}
+
+/* Collection selector - fixed height */
+.collection-selector {
+    flex-shrink: 0;
+    /* Prevent selector from shrinking */
+    padding: 12px 10px;
+    background-color: var(--bg-secondary);
 }
 
 #fileTree {
     flex: 1;
+    /* Take remaining space */
     overflow-y: auto;
+    /* Enable vertical scrolling */
     overflow-x: hidden;
-    padding: 4px 0;
-}
-
-/* Navbar */
-.navbar {
-    background-color: var(--bg-secondary);
-    border-bottom: 1px solid var(--border-color);
-    transition: background-color 0.3s ease;
-}
-
-.navbar-brand {
-    color: var(--text-primary) !important;
-    font-weight: 600;
+    padding: 4px 10px;
+    min-height: 0;
+    /* Important: allows flex child to shrink below content size */
 }
 
 /* Scrollbar styling */
@@ -135,28 +259,86 @@ html, body {
 
 /* Preview Pane Styling */
 #previewPane {
-    flex: 1 1 40%;
     min-width: 250px;
     max-width: 70%;
     padding: 0;
-    overflow-y: auto;
-    overflow-x: hidden;
     background-color: var(--bg-primary);
     border-left: 1px solid var(--border-color);
+    flex: 1;
+    height: 100%;
+    overflow-y: auto;
+    /* Enable vertical scrolling for preview pane */
+    overflow-x: hidden;
 }
 
 #preview {
     padding: 20px;
-    min-height: 100%;
     overflow-wrap: break-word;
     word-wrap: break-word;
+    color: var(--text-primary);
+    min-height: 100%;
+    /* Ensure content fills at least the full height */
 }
 
-#preview > p:first-child {
+#preview>p:first-child {
     margin-top: 0;
 }
 
-#preview > h1:first-child,
-#preview > h2:first-child {
+#preview>h1:first-child,
+#preview>h2:first-child {
     margin-top: 0;
 }
+
+/* Iframe styles in preview - minimal defaults that can be overridden */
+#preview iframe {
+    border: none;
+    /* Default to no border, can be overridden by inline styles */
+    display: block;
+    /* Prevent inline spacing issues */
+}
+
+/* View Mode Styles */
+body.view-mode #editorPane {
+    display: none;
+}
+
+body.view-mode #resizer1 {
+    display: none;
+}
+
+body.view-mode #resizer2 {
+    display: none;
+}
+
+body.view-mode #previewPane {
+    max-width: 100%;
+    min-width: auto;
+}
+
+body.view-mode #sidebarPane {
+    display: flex;
+    flex: 0 0 20%;
+    height: 100%;
+    /* Keep sidebar at 20% width in view mode */
+}
+
+body.edit-mode #editorPane {
+    display: flex;
+}
+
+body.edit-mode #resizer1 {
+    display: block;
+}
+
+body.edit-mode #resizer2 {
+    display: block;
+}
+
+body.edit-mode #previewPane {
+    max-width: 70%;
+}
+
+body.edit-mode #sidebarPane {
+    display: flex;
+    height: 100%;
+}

static/js/app.js

@@ -12,25 +12,262 @@ let collectionSelector;
 let clipboard = null;
 let currentFilePath = null;
 
-// Simple event bus
-const eventBus = {
-    listeners: {},
-    on(event, callback) {
-        if (!this.listeners[event]) {
-            this.listeners[event] = [];
+// Event bus is now loaded from event-bus.js module
+// No need to define it here - it's available as window.eventBus
+
+/**
+ * Auto-load page in view mode
+ * Tries to load the last viewed page, falls back to first file if none saved
+ */
+async function autoLoadPageInViewMode() {
+    if (!editor || !fileTree) return;
+
+    try {
+        // Try to get last viewed page
+        let pageToLoad = editor.getLastViewedPage();
+
+        // If no last viewed page, get the first markdown file
+        if (!pageToLoad) {
+            pageToLoad = fileTree.getFirstMarkdownFile();
         }
-        this.listeners[event].push(callback);
-    },
-    dispatch(event, data) {
-        if (this.listeners[event]) {
-            this.listeners[event].forEach(callback => callback(data));
+
+        // If we found a page to load, load it
+        if (pageToLoad) {
+            // Use fileTree.onFileSelect to handle both text and binary files
+            if (fileTree.onFileSelect) {
+                fileTree.onFileSelect({ path: pageToLoad, isDirectory: false });
+            } else {
+                // Fallback to direct loading (for text files only)
+                await editor.loadFile(pageToLoad);
+                fileTree.selectAndExpandPath(pageToLoad);
+            }
+        } else {
+            // No files found, show empty state message
+            editor.previewElement.innerHTML = `
+                <div class="text-muted text-center mt-5">
+                    <p>No content available</p>
+                </div>
+            `;
+        }
+    } catch (error) {
+        console.error('Failed to auto-load page in view mode:', error);
+        editor.previewElement.innerHTML = `
+            <div class="alert alert-danger">
+                <p>Failed to load content</p>
+            </div>
+        `;
+    }
+}
+
+/**
+ * Show directory preview with list of files
+ * @param {string} dirPath - The directory path
+ */
+async function showDirectoryPreview(dirPath) {
+    if (!editor || !fileTree || !webdavClient) return;
+
+    try {
+        const dirName = dirPath.split('/').pop() || dirPath;
+        const files = fileTree.getDirectoryFiles(dirPath);
+
+        // Start building the preview HTML
+        let html = `<div class="directory-preview">`;
+        html += `<h2>${dirName}</h2>`;
+
+        if (files.length === 0) {
+            html += `<p>This directory is empty</p>`;
+        } else {
+            html += `<div class="directory-files">`;
+
+            // Create cards for each file
+            for (const file of files) {
+                const fileName = file.name;
+                let fileDescription = '';
+
+                // Try to get file description from markdown files
+                if (file.name.endsWith('.md')) {
+                    try {
+                        const content = await webdavClient.get(file.path);
+                        // Extract first heading or first line as description
+                        const lines = content.split('\n');
+                        for (const line of lines) {
+                            if (line.trim().startsWith('#')) {
+                                fileDescription = line.replace(/^#+\s*/, '').trim();
+                                break;
+                            } else if (line.trim() && !line.startsWith('---')) {
+                                fileDescription = line.trim().substring(0, 100);
+                                break;
                             }
                         }
-};
-window.eventBus = eventBus;
+                    } catch (error) {
+                        console.error('Failed to read file description:', error);
+                    }
+                }
+
+                html += `
+                    <div class="file-card" data-path="${file.path}">
+                        <div class="file-card-header">
+                            <i class="bi bi-file-earmark-text"></i>
+                            <span class="file-card-name">${fileName}</span>
+                        </div>
+                        ${fileDescription ? `<div class="file-card-description">${fileDescription}</div>` : ''}
+                    </div>
+                `;
+            }
+
+            html += `</div>`;
+        }
+
+        html += `</div>`;
+
+        // Set the preview content
+        editor.previewElement.innerHTML = html;
+
+        // Add click handlers to file cards
+        editor.previewElement.querySelectorAll('.file-card').forEach(card => {
+            card.addEventListener('click', async () => {
+                const filePath = card.dataset.path;
+                await editor.loadFile(filePath);
+                fileTree.selectAndExpandPath(filePath);
+            });
+        });
+    } catch (error) {
+        console.error('Failed to show directory preview:', error);
+        editor.previewElement.innerHTML = `
+            <div class="alert alert-danger">
+                <p>Failed to load directory preview</p>
+            </div>
+        `;
+    }
+}
+
+/**
+ * Parse URL to extract collection and file path
+ * URL format: /<collection>/<file_path> or /<collection>/<dir>/<file>
+ * @returns {Object} {collection, filePath} or {collection, null} if only collection
+ */
+function parseURLPath() {
+    const pathname = window.location.pathname;
+    const parts = pathname.split('/').filter(p => p); // Remove empty parts
+
+    if (parts.length === 0) {
+        return { collection: null, filePath: null };
+    }
+
+    const collection = parts[0];
+    const filePath = parts.length > 1 ? parts.slice(1).join('/') : null;
+
+    return { collection, filePath };
+}
+
+/**
+ * Update URL based on current collection and file
+ * @param {string} collection - The collection name
+ * @param {string} filePath - The file path (optional)
+ * @param {boolean} isEditMode - Whether in edit mode
+ */
+function updateURL(collection, filePath, isEditMode) {
+    let url = `/${collection}`;
+    if (filePath) {
+        url += `/${filePath}`;
+    }
+    if (isEditMode) {
+        url += '?edit=true';
+    }
+
+    // Use pushState to update URL without reloading
+    window.history.pushState({ collection, filePath }, '', url);
+}
+
+/**
+ * Load file from URL path
+ * Assumes the collection is already set and file tree is loaded
+ * @param {string} collection - The collection name (for validation)
+ * @param {string} filePath - The file path
+ */
+async function loadFileFromURL(collection, filePath) {
+    console.log('[loadFileFromURL] Called with:', { collection, filePath });
+
+    if (!fileTree || !editor || !collectionSelector) {
+        console.error('[loadFileFromURL] Missing dependencies:', { fileTree: !!fileTree, editor: !!editor, collectionSelector: !!collectionSelector });
+        return;
+    }
+
+    try {
+        // Verify we're on the right collection
+        const currentCollection = collectionSelector.getCurrentCollection();
+        if (currentCollection !== collection) {
+            console.error(`[loadFileFromURL] Collection mismatch: expected ${collection}, got ${currentCollection}`);
+            return;
+        }
+
+        // Load the file or directory
+        if (filePath) {
+            // Check if the path is a directory or a file
+            const node = fileTree.findNode(filePath);
+            console.log('[loadFileFromURL] Found node:', node);
+
+            if (node && node.isDirectory) {
+                // It's a directory, show directory preview
+                console.log('[loadFileFromURL] Loading directory preview');
+                await showDirectoryPreview(filePath);
+                fileTree.selectAndExpandPath(filePath);
+            } else if (node) {
+                // It's a file, check if it's binary
+                console.log('[loadFileFromURL] Loading file');
+
+                // Use the fileTree.onFileSelect callback to handle both text and binary files
+                if (fileTree.onFileSelect) {
+                    fileTree.onFileSelect({ path: filePath, isDirectory: false });
+                } else {
+                    // Fallback to direct loading
+                    await editor.loadFile(filePath);
+                    fileTree.selectAndExpandPath(filePath);
+                }
+            } else {
+                console.error(`[loadFileFromURL] Path not found in file tree: ${filePath}`);
+            }
+        }
+    } catch (error) {
+        console.error('[loadFileFromURL] Failed to load file from URL:', error);
+    }
+}
+
+/**
+ * Handle browser back/forward navigation
+ */
+function setupPopStateListener() {
+    window.addEventListener('popstate', async (event) => {
+        const { collection, filePath } = parseURLPath();
+        if (collection) {
+            // Ensure the collection is set
+            const currentCollection = collectionSelector.getCurrentCollection();
+            if (currentCollection !== collection) {
+                await collectionSelector.setCollection(collection);
+                await fileTree.load();
+            }
+
+            // Load the file/directory
+            await loadFileFromURL(collection, filePath);
+        }
+    });
+}
 
 // Initialize application
 document.addEventListener('DOMContentLoaded', async () => {
+    // Determine view mode from URL parameter
+    const urlParams = new URLSearchParams(window.location.search);
+    const isEditMode = urlParams.get('edit') === 'true';
+
+    // Set view mode class on body
+    if (isEditMode) {
+        document.body.classList.add('edit-mode');
+        document.body.classList.remove('view-mode');
+    } else {
+        document.body.classList.add('view-mode');
+        document.body.classList.remove('edit-mode');
+    }
+
     // Initialize WebDAV client
     webdavClient = new WebDAVClient('/fs/');
 
@@ -40,24 +277,241 @@ document.addEventListener('DOMContentLoaded', async () => {
         darkMode.toggle();
     });
 
-    // Initialize file tree
-    fileTree = new FileTree('fileTree', webdavClient);
-    fileTree.onFileSelect = async (item) => {
-        await editor.loadFile(item.path);
-    };
+    // Initialize sidebar toggle
+    const sidebarToggle = new SidebarToggle('sidebarPane', 'sidebarToggleBtn');
 
-    // Initialize collection selector
+    // Initialize collection selector (always needed)
     collectionSelector = new CollectionSelector('collectionSelect', webdavClient);
-    collectionSelector.onChange = async (collection) => {
-        await fileTree.load();
-    };
     await collectionSelector.load();
-    await fileTree.load();
 
-    // Initialize editor
-    editor = new MarkdownEditor('editor', 'preview', 'filenameInput');
+    // Setup New Collection button
+    document.getElementById('newCollectionBtn').addEventListener('click', async () => {
+        try {
+            const collectionName = await window.ModalManager.prompt(
+                'Enter new collection name (lowercase, underscore only):',
+                'new_collection'
+            );
+
+            if (!collectionName) return;
+
+            // Validate collection name
+            const validation = ValidationUtils.validateFileName(collectionName, true);
+            if (!validation.valid) {
+                window.showNotification(validation.message, 'warning');
+                return;
+            }
+
+            // Create the collection
+            await webdavClient.createCollection(validation.sanitized);
+
+            // Reload collections and switch to the new one
+            await collectionSelector.load();
+            await collectionSelector.setCollection(validation.sanitized);
+
+            window.showNotification(`Collection "${validation.sanitized}" created`, 'success');
+        } catch (error) {
+            Logger.error('Failed to create collection:', error);
+            window.showNotification('Failed to create collection', 'error');
+        }
+    });
+
+    // Setup URL routing
+    setupPopStateListener();
+
+    // Initialize editor (always needed for preview)
+    // In view mode, editor is read-only
+    editor = new MarkdownEditor('editor', 'preview', 'filenameInput', !isEditMode);
     editor.setWebDAVClient(webdavClient);
 
+    // Initialize file tree (needed in both modes)
+    // Pass isEditMode to control image filtering (hide images only in view mode)
+    fileTree = new FileTree('fileTree', webdavClient, isEditMode);
+    fileTree.onFileSelect = async (item) => {
+        try {
+            const currentCollection = collectionSelector.getCurrentCollection();
+
+            // Check if the file is a binary/non-editable file
+            if (PathUtils.isBinaryFile(item.path)) {
+                const fileType = PathUtils.getFileType(item.path);
+                const fileName = PathUtils.getFileName(item.path);
+
+                Logger.info(`Previewing binary file: ${item.path}`);
+
+                // Initialize and show loading spinner for binary file preview
+                editor.initLoadingSpinners();
+                if (editor.previewSpinner) {
+                    editor.previewSpinner.show(`Loading ${fileType.toLowerCase()}...`);
+                }
+
+                // Set flag to prevent auto-update of preview
+                editor.isShowingCustomPreview = true;
+
+                // In edit mode, show a warning notification
+                if (isEditMode) {
+                    if (window.showNotification) {
+                        window.showNotification(
+                            `"${fileName}" is read-only. Showing preview only.`,
+                            'warning'
+                        );
+                    }
+
+                    // Hide the editor pane temporarily
+                    const editorPane = document.getElementById('editorPane');
+                    const resizer1 = document.getElementById('resizer1');
+                    if (editorPane) editorPane.style.display = 'none';
+                    if (resizer1) resizer1.style.display = 'none';
+                }
+
+                // Clear the editor (but don't trigger preview update due to flag)
+                if (editor.editor) {
+                    editor.editor.setValue('');
+                }
+                editor.filenameInput.value = item.path;
+                editor.currentFile = item.path;
+
+                // Build the file URL using the WebDAV client's method
+                const fileUrl = webdavClient.getFullUrl(item.path);
+                Logger.debug(`Binary file URL: ${fileUrl}`);
+
+                // Generate preview HTML based on file type
+                let previewHtml = '';
+
+                if (fileType === 'Image') {
+                    // Preview images
+                    previewHtml = `
+                        <div style="padding: 20px; text-align: center;">
+                            <h3>${fileName}</h3>
+                            <p style="color: var(--text-secondary); margin-bottom: 20px;">Image Preview (Read-only)</p>
+                            <img src="${fileUrl}" alt="${fileName}" style="max-width: 100%; height: auto; border: 1px solid var(--border-color); border-radius: 4px;">
+                        </div>
+                    `;
+                } else if (fileType === 'PDF') {
+                    // Preview PDFs
+                    previewHtml = `
+                        <div style="padding: 20px;">
+                            <h3>${fileName}</h3>
+                            <p style="color: var(--text-secondary); margin-bottom: 20px;">PDF Preview (Read-only)</p>
+                            <iframe src="${fileUrl}" style="width: 100%; height: 80vh; border: 1px solid var(--border-color); border-radius: 4px;"></iframe>
+                        </div>
+                    `;
+                } else {
+                    // For other binary files, show download link
+                    previewHtml = `
+                        <div style="padding: 20px;">
+                            <h3>${fileName}</h3>
+                            <p style="color: var(--text-secondary); margin-bottom: 20px;">${fileType} File (Read-only)</p>
+                            <p>This file cannot be previewed in the browser.</p>
+                            <a href="${fileUrl}" download="${fileName}" class="btn btn-primary">Download ${fileName}</a>
+                        </div>
+                    `;
+                }
+
+                // Display in preview pane
+                editor.previewElement.innerHTML = previewHtml;
+
+                // Hide loading spinner after content is set
+                // Add small delay for images to start loading
+                setTimeout(() => {
+                    if (editor.previewSpinner) {
+                        editor.previewSpinner.hide();
+                    }
+                }, fileType === 'Image' ? 300 : 100);
+
+                // Highlight the file in the tree
+                fileTree.selectAndExpandPath(item.path);
+
+                // Save as last viewed page (for binary files too)
+                editor.saveLastViewedPage(item.path);
+
+                // Update URL to reflect current file
+                updateURL(currentCollection, item.path, isEditMode);
+
+                return;
+            }
+
+            // For text files, restore the editor pane if it was hidden
+            if (isEditMode) {
+                const editorPane = document.getElementById('editorPane');
+                const resizer1 = document.getElementById('resizer1');
+                if (editorPane) editorPane.style.display = '';
+                if (resizer1) resizer1.style.display = '';
+            }
+
+            await editor.loadFile(item.path);
+            // Highlight the file in the tree and expand parent directories
+            fileTree.selectAndExpandPath(item.path);
+            // Update URL to reflect current file
+            updateURL(currentCollection, item.path, isEditMode);
+        } catch (error) {
+            Logger.error('Failed to select file:', error);
+            if (window.showNotification) {
+                window.showNotification('Failed to load file', 'error');
+            }
+        }
+    };
+
+    fileTree.onFolderSelect = async (item) => {
+        try {
+            // Show directory preview
+            await showDirectoryPreview(item.path);
+            // Highlight the directory in the tree and expand parent directories
+            fileTree.selectAndExpandPath(item.path);
+            // Update URL to reflect current directory
+            const currentCollection = collectionSelector.getCurrentCollection();
+            updateURL(currentCollection, item.path, isEditMode);
+        } catch (error) {
+            Logger.error('Failed to select folder:', error);
+            if (window.showNotification) {
+                window.showNotification('Failed to load folder', 'error');
+            }
+        }
+    };
+
+    collectionSelector.onChange = async (collection) => {
+        try {
+            await fileTree.load();
+            // In view mode, auto-load last viewed page when collection changes
+            if (!isEditMode) {
+                await autoLoadPageInViewMode();
+            }
+        } catch (error) {
+            Logger.error('Failed to change collection:', error);
+            if (window.showNotification) {
+                window.showNotification('Failed to change collection', 'error');
+            }
+        }
+    };
+    await fileTree.load();
+
+    // Parse URL to load file if specified
+    const { collection: urlCollection, filePath: urlFilePath } = parseURLPath();
+    console.log('[URL PARSE]', { urlCollection, urlFilePath });
+
+    if (urlCollection) {
+        // First ensure the collection is set
+        const currentCollection = collectionSelector.getCurrentCollection();
+        if (currentCollection !== urlCollection) {
+            console.log('[URL LOAD] Switching collection from', currentCollection, 'to', urlCollection);
+            await collectionSelector.setCollection(urlCollection);
+            await fileTree.load();
+        }
+
+        // If there's a file path in the URL, load it
+        if (urlFilePath) {
+            console.log('[URL LOAD] Loading file from URL:', urlCollection, urlFilePath);
+            await loadFileFromURL(urlCollection, urlFilePath);
+        } else if (!isEditMode) {
+            // Collection-only URL in view mode: auto-load last viewed page
+            console.log('[URL LOAD] Collection-only URL, auto-loading page');
+            await autoLoadPageInViewMode();
+        }
+    } else if (!isEditMode) {
+        // No URL collection specified, in view mode: auto-load last viewed page
+        await autoLoadPageInViewMode();
+    }
+
+    // Initialize file tree and editor-specific features only in edit mode
+    if (isEditMode) {
         // Add test content to verify preview works
         setTimeout(() => {
             if (!editor.editor.getValue()) {
@@ -70,7 +524,11 @@ document.addEventListener('DOMContentLoaded', async () => {
         const editorDropHandler = new EditorDropHandler(
             document.querySelector('.editor-container'),
             async (file) => {
+                try {
                     await handleEditorFileDrop(file);
+                } catch (error) {
+                    Logger.error('Failed to handle file drop:', error);
+                }
             }
         );
 
@@ -80,33 +538,103 @@ document.addEventListener('DOMContentLoaded', async () => {
         });
 
         document.getElementById('saveBtn').addEventListener('click', async () => {
+            try {
                 await editor.save();
+            } catch (error) {
+                Logger.error('Failed to save file:', error);
+                if (window.showNotification) {
+                    window.showNotification('Failed to save file', 'error');
+                }
+            }
         });
 
         document.getElementById('deleteBtn').addEventListener('click', async () => {
+            try {
                 await editor.deleteFile();
+            } catch (error) {
+                Logger.error('Failed to delete file:', error);
+                if (window.showNotification) {
+                    window.showNotification('Failed to delete file', 'error');
+                }
+            }
         });
 
         // Setup context menu handlers
         setupContextMenuHandlers();
 
-    // Initialize mermaid
-    mermaid.initialize({ startOnLoad: true, theme: darkMode.isDark ? 'dark' : 'default' });
-
         // Initialize file tree actions manager
         window.fileTreeActions = new FileTreeActions(webdavClient, fileTree, editor);
+
+        // Setup Exit Edit Mode button
+        document.getElementById('exitEditModeBtn').addEventListener('click', () => {
+            // Switch to view mode by removing edit=true from URL
+            const url = new URL(window.location.href);
+            url.searchParams.delete('edit');
+            window.location.href = url.toString();
+        });
+
+        // Hide Edit Mode button in edit mode
+        document.getElementById('editModeBtn').style.display = 'none';
+    } else {
+        // In view mode, hide editor buttons
+        document.getElementById('newBtn').style.display = 'none';
+        document.getElementById('saveBtn').style.display = 'none';
+        document.getElementById('deleteBtn').style.display = 'none';
+        document.getElementById('exitEditModeBtn').style.display = 'none';
+
+        // Show Edit Mode button in view mode
+        document.getElementById('editModeBtn').style.display = 'block';
+
+        // Setup Edit Mode button
+        document.getElementById('editModeBtn').addEventListener('click', () => {
+            // Switch to edit mode by adding edit=true to URL
+            const url = new URL(window.location.href);
+            url.searchParams.set('edit', 'true');
+            window.location.href = url.toString();
+        });
+
+        // Auto-load last viewed page or first file
+        await autoLoadPageInViewMode();
+    }
+
+    // Setup clickable navbar brand (logo/title)
+    const navbarBrand = document.getElementById('navbarBrand');
+    if (navbarBrand) {
+        navbarBrand.addEventListener('click', (e) => {
+            e.preventDefault();
+            const currentCollection = collectionSelector ? collectionSelector.getCurrentCollection() : null;
+            if (currentCollection) {
+                // Navigate to collection root
+                window.location.href = `/${currentCollection}/`;
+            } else {
+                // Navigate to home page
+                window.location.href = '/';
+            }
+        });
+    }
+
+    // Initialize mermaid (always needed)
+    mermaid.initialize({ startOnLoad: true, theme: darkMode.isDark ? 'dark' : 'default' });
     // Listen for file-saved event to reload file tree
     window.eventBus.on('file-saved', async (path) => {
+        try {
             if (fileTree) {
                 await fileTree.load();
                 fileTree.selectNode(path);
             }
+        } catch (error) {
+            Logger.error('Failed to reload file tree after save:', error);
+        }
     });
 
     window.eventBus.on('file-deleted', async () => {
+        try {
             if (fileTree) {
                 await fileTree.load();
             }
+        } catch (error) {
+            Logger.error('Failed to reload file tree after delete:', error);
+        }
     });
 });
 
@@ -168,10 +696,11 @@ async function handleEditorFileDrop(file) {
         const uploadedPath = await fileTree.uploadFile(targetDir, file);
 
         // Insert markdown link at cursor
+        // Use relative path (without collection name) so the image renderer can resolve it correctly
         const isImage = file.type.startsWith('image/');
         const link = isImage
-            ? `![${file.name}](/${webdavClient.currentCollection}/${uploadedPath})`
-            : `[${file.name}](/${webdavClient.currentCollection}/${uploadedPath})`;
+            ? `![${file.name}](${uploadedPath})`
+            : `[${file.name}](${uploadedPath})`;
 
         editor.insertAtCursor(link);
         showNotification(`Uploaded and inserted link`, 'success');

static/js/collection-selector.js

@@ -0,0 +1,152 @@
+/**
+ * Collection Selector Module
+ * Manages the collection dropdown selector and persistence
+ */
+
+class CollectionSelector {
+    constructor(selectId, webdavClient) {
+        this.select = document.getElementById(selectId);
+        this.webdavClient = webdavClient;
+        this.onChange = null;
+        this.storageKey = Config.STORAGE_KEYS.SELECTED_COLLECTION;
+    }
+
+    /**
+     * Load collections from WebDAV and populate the selector
+     */
+    async load() {
+        try {
+            const collections = await this.webdavClient.getCollections();
+            this.select.innerHTML = '';
+
+            collections.forEach(collection => {
+                const option = document.createElement('option');
+                option.value = collection;
+                option.textContent = collection;
+                this.select.appendChild(option);
+            });
+
+            // Determine which collection to select (priority: URL > localStorage > first)
+            let collectionToSelect = collections[0]; // Default to first
+
+            // Check URL first (highest priority)
+            const urlCollection = this.getCollectionFromURL();
+            if (urlCollection && collections.includes(urlCollection)) {
+                collectionToSelect = urlCollection;
+                Logger.info(`Using collection from URL: ${urlCollection}`);
+            } else {
+                // Fall back to localStorage
+                const savedCollection = localStorage.getItem(this.storageKey);
+                if (savedCollection && collections.includes(savedCollection)) {
+                    collectionToSelect = savedCollection;
+                    Logger.info(`Using collection from localStorage: ${savedCollection}`);
+                }
+            }
+
+            if (collections.length > 0) {
+                this.select.value = collectionToSelect;
+                this.webdavClient.setCollection(collectionToSelect);
+                if (this.onChange) {
+                    this.onChange(collectionToSelect);
+                }
+            }
+
+            // Add change listener
+            this.select.addEventListener('change', () => {
+                const collection = this.select.value;
+                // Save to localStorage
+                localStorage.setItem(this.storageKey, collection);
+                this.webdavClient.setCollection(collection);
+
+                Logger.info(`Collection changed to: ${collection}`);
+
+                // Update URL to reflect collection change
+                this.updateURLForCollection(collection);
+
+                if (this.onChange) {
+                    this.onChange(collection);
+                }
+            });
+
+            Logger.debug(`Loaded ${collections.length} collections`);
+        } catch (error) {
+            Logger.error('Failed to load collections:', error);
+            if (window.showNotification) {
+                window.showNotification('Failed to load collections', 'error');
+            }
+        }
+    }
+
+    /**
+     * Get the currently selected collection
+     * @returns {string} The collection name
+     */
+    getCurrentCollection() {
+        return this.select.value;
+    }
+
+    /**
+     * Set the collection to a specific value
+     * @param {string} collection - The collection name to set
+     */
+    async setCollection(collection) {
+        const collections = Array.from(this.select.options).map(opt => opt.value);
+        if (collections.includes(collection)) {
+            this.select.value = collection;
+            localStorage.setItem(this.storageKey, collection);
+            this.webdavClient.setCollection(collection);
+
+            Logger.info(`Collection set to: ${collection}`);
+
+            // Update URL to reflect collection change
+            this.updateURLForCollection(collection);
+
+            if (this.onChange) {
+                this.onChange(collection);
+            }
+        } else {
+            Logger.warn(`Collection "${collection}" not found in available collections`);
+        }
+    }
+
+    /**
+     * Update the browser URL to reflect the current collection
+     * @param {string} collection - The collection name
+     */
+    updateURLForCollection(collection) {
+        // Get current URL parameters
+        const urlParams = new URLSearchParams(window.location.search);
+        const isEditMode = urlParams.get('edit') === 'true';
+
+        // Build new URL with collection
+        let url = `/${collection}/`;
+        if (isEditMode) {
+            url += '?edit=true';
+        }
+
+        // Use pushState to update URL without reloading
+        window.history.pushState({ collection, filePath: null }, '', url);
+        Logger.debug(`Updated URL to: ${url}`);
+    }
+
+    /**
+     * Extract collection name from current URL
+     * URL format: /<collection>/ or /<collection>/<file_path>
+     * @returns {string|null} The collection name or null if not found
+     */
+    getCollectionFromURL() {
+        const pathname = window.location.pathname;
+        const parts = pathname.split('/').filter(p => p); // Remove empty parts
+
+        if (parts.length === 0) {
+            return null;
+        }
+
+        // First part is the collection
+        return parts[0];
+    }
+}
+
+// Make CollectionSelector globally available
+window.CollectionSelector = CollectionSelector;
+

static/js/column-resizer.js

@@ -50,7 +50,6 @@ class ColumnResizer {
                 const containerFlex = this.sidebarPane.offsetWidth;
 
                 this.editorPane.style.flex = `0 0 ${newWidth2}px`;
-                this.previewPane.style.flex = `1 1 auto`;
             }
         };
 
@@ -89,7 +88,6 @@ class ColumnResizer {
             const { sidebar, editor, preview } = JSON.parse(saved);
             this.sidebarPane.style.flex = `0 0 ${sidebar}px`;
             this.editorPane.style.flex = `0 0 ${editor}px`;
-            this.previewPane.style.flex = `1 1 auto`;
         } catch (error) {
             console.error('Failed to load column dimensions:', error);
         }

static/js/config.js

@@ -0,0 +1,207 @@
+/**
+ * Application Configuration
+ * Centralized configuration values for the markdown editor
+ */
+
+const Config = {
+    // ===== TIMING CONFIGURATION =====
+
+    /**
+     * Long-press threshold in milliseconds
+     * Used for drag-and-drop detection in file tree
+     */
+    LONG_PRESS_THRESHOLD: 400,
+
+    /**
+     * Debounce delay in milliseconds
+     * Used for editor preview updates
+     */
+    DEBOUNCE_DELAY: 300,
+
+    /**
+     * Toast notification duration in milliseconds
+     */
+    TOAST_DURATION: 3000,
+
+    /**
+     * Mouse move threshold in pixels
+     * Used to detect if user is dragging vs clicking
+     */
+    MOUSE_MOVE_THRESHOLD: 5,
+
+    // ===== UI CONFIGURATION =====
+
+    /**
+     * Drag preview width in pixels
+     * Width of the drag ghost image during drag-and-drop
+     */
+    DRAG_PREVIEW_WIDTH: 200,
+
+    /**
+     * Tree indentation in pixels
+     * Indentation per level in the file tree
+     */
+    TREE_INDENT_PX: 12,
+
+    /**
+     * Toast container z-index
+     * Ensures toasts appear above other elements
+     */
+    TOAST_Z_INDEX: 9999,
+
+    /**
+     * Minimum sidebar width in pixels
+     */
+    MIN_SIDEBAR_WIDTH: 150,
+
+    /**
+     * Maximum sidebar width as percentage of container
+     */
+    MAX_SIDEBAR_WIDTH_PERCENT: 40,
+
+    /**
+     * Minimum editor width in pixels
+     */
+    MIN_EDITOR_WIDTH: 250,
+
+    /**
+     * Maximum editor width as percentage of container
+     */
+    MAX_EDITOR_WIDTH_PERCENT: 70,
+
+    // ===== VALIDATION CONFIGURATION =====
+
+    /**
+     * Valid filename pattern
+     * Only lowercase letters, numbers, underscores, and dots allowed
+     */
+    FILENAME_PATTERN: /^[a-z0-9_]+(\.[a-z0-9_]+)*$/,
+
+    /**
+     * Characters to replace in filenames
+     * All invalid characters will be replaced with underscore
+     */
+    FILENAME_INVALID_CHARS: /[^a-z0-9_.]/g,
+
+    // ===== STORAGE KEYS =====
+
+    /**
+     * LocalStorage keys used throughout the application
+     */
+    STORAGE_KEYS: {
+        /**
+         * Dark mode preference
+         */
+        DARK_MODE: 'darkMode',
+
+        /**
+         * Currently selected collection
+         */
+        SELECTED_COLLECTION: 'selectedCollection',
+
+        /**
+         * Last viewed page (per collection)
+         * Actual key will be: lastViewedPage:{collection}
+         */
+        LAST_VIEWED_PAGE: 'lastViewedPage',
+
+        /**
+         * Column dimensions (sidebar, editor, preview widths)
+         */
+        COLUMN_DIMENSIONS: 'columnDimensions',
+
+        /**
+         * Sidebar collapsed state
+         */
+        SIDEBAR_COLLAPSED: 'sidebarCollapsed'
+    },
+
+    // ===== EDITOR CONFIGURATION =====
+
+    /**
+     * CodeMirror theme for light mode
+     */
+    EDITOR_THEME_LIGHT: 'default',
+
+    /**
+     * CodeMirror theme for dark mode
+     */
+    EDITOR_THEME_DARK: 'monokai',
+
+    /**
+     * Mermaid theme for light mode
+     */
+    MERMAID_THEME_LIGHT: 'default',
+
+    /**
+     * Mermaid theme for dark mode
+     */
+    MERMAID_THEME_DARK: 'dark',
+
+    // ===== FILE TREE CONFIGURATION =====
+
+    /**
+     * Default content for new files
+     */
+    DEFAULT_FILE_CONTENT: '# New File\n\n',
+
+    /**
+     * Default filename for new files
+     */
+    DEFAULT_NEW_FILENAME: 'new_file.md',
+
+    /**
+     * Default folder name for new folders
+     */
+    DEFAULT_NEW_FOLDERNAME: 'new_folder',
+
+    // ===== WEBDAV CONFIGURATION =====
+
+    /**
+     * WebDAV base URL
+     */
+    WEBDAV_BASE_URL: '/fs/',
+
+    /**
+     * PROPFIND depth for file tree loading
+     */
+    PROPFIND_DEPTH: 'infinity',
+
+    // ===== DRAG AND DROP CONFIGURATION =====
+
+    /**
+     * Drag preview opacity
+     */
+    DRAG_PREVIEW_OPACITY: 0.8,
+
+    /**
+     * Dragging item opacity
+     */
+    DRAGGING_OPACITY: 0.4,
+
+    /**
+     * Drag preview offset X in pixels
+     */
+    DRAG_PREVIEW_OFFSET_X: 10,
+
+    /**
+     * Drag preview offset Y in pixels
+     */
+    DRAG_PREVIEW_OFFSET_Y: 10,
+
+    // ===== NOTIFICATION TYPES =====
+
+    /**
+     * Bootstrap notification type mappings
+     */
+    NOTIFICATION_TYPES: {
+        SUCCESS: 'success',
+        ERROR: 'danger',
+        WARNING: 'warning',
+        INFO: 'primary'
+    }
+};
+
+// Make Config globally available
+window.Config = Config;
+

static/js/confirmation.js

@@ -1,68 +1,180 @@
 /**
- * Confirmation Modal Manager
+ * Unified Modal Manager
  * Handles showing and hiding a Bootstrap modal for confirmations and prompts.
+ * Uses a single reusable modal element to prevent double-opening issues.
  */
-class Confirmation {
+class ModalManager {
     constructor(modalId) {
         this.modalElement = document.getElementById(modalId);
-        this.modal = new bootstrap.Modal(this.modalElement);
+        if (!this.modalElement) {
+            console.error(`Modal element with id "${modalId}" not found`);
+            return;
+        }
+
+        this.modal = new bootstrap.Modal(this.modalElement, {
+            backdrop: 'static',
+            keyboard: true
+        });
+
         this.messageElement = this.modalElement.querySelector('#confirmationMessage');
         this.inputElement = this.modalElement.querySelector('#confirmationInput');
         this.confirmButton = this.modalElement.querySelector('#confirmButton');
+        this.cancelButton = this.modalElement.querySelector('[data-bs-dismiss="modal"]');
         this.titleElement = this.modalElement.querySelector('.modal-title');
         this.currentResolver = null;
+        this.isShowing = false;
     }
 
-    _show(message, title, showInput = false, defaultValue = '') {
+    /**
+     * Show a confirmation dialog
+     * @param {string} message - The message to display
+     * @param {string} title - The dialog title
+     * @param {boolean} isDangerous - Whether this is a dangerous action (shows red button)
+     * @returns {Promise<boolean>} - Resolves to true if confirmed, false/null if cancelled
+     */
+    confirm(message, title = 'Confirmation', isDangerous = false) {
         return new Promise((resolve) => {
+            // Prevent double-opening
+            if (this.isShowing) {
+                console.warn('Modal is already showing, ignoring duplicate request');
+                resolve(null);
+                return;
+            }
+
+            this.isShowing = true;
             this.currentResolver = resolve;
             this.titleElement.textContent = title;
             this.messageElement.textContent = message;
-
-            if (showInput) {
-                this.inputElement.style.display = 'block';
-                this.inputElement.value = defaultValue;
-                this.inputElement.focus();
-            } else {
             this.inputElement.style.display = 'none';
+
+            // Update button styling based on danger level
+            if (isDangerous) {
+                this.confirmButton.className = 'btn-flat btn-flat-danger';
+                this.confirmButton.innerHTML = '<i class="bi bi-trash"></i> Delete';
+            } else {
+                this.confirmButton.className = 'btn-flat btn-flat-primary';
+                this.confirmButton.innerHTML = '<i class="bi bi-check-circle"></i> OK';
             }
 
-            this.confirmButton.onclick = () => this._handleConfirm(showInput);
-            this.modalElement.addEventListener('hidden.bs.modal', () => this._handleCancel(), { once: true });
+            // Set up event handlers
+            this.confirmButton.onclick = (e) => {
+                e.preventDefault();
+                e.stopPropagation();
+                this._handleConfirm(false);
+            };
+
+            // Handle modal hidden event for cleanup
+            this.modalElement.addEventListener('hidden.bs.modal', () => {
+                if (this.currentResolver) {
+                    this._handleCancel();
+                }
+            }, { once: true });
+
+            // Remove aria-hidden before showing to prevent accessibility warning
+            this.modalElement.removeAttribute('aria-hidden');
 
             this.modal.show();
+
+            // Focus confirm button after modal is shown
+            this.modalElement.addEventListener('shown.bs.modal', () => {
+                this.confirmButton.focus();
+            }, { once: true });
+        });
+    }
+
+    /**
+     * Show a prompt dialog (input dialog)
+     * @param {string} message - The message/label to display
+     * @param {string} defaultValue - The default input value
+     * @param {string} title - The dialog title
+     * @returns {Promise<string|null>} - Resolves to input value if confirmed, null if cancelled
+     */
+    prompt(message, defaultValue = '', title = 'Input') {
+        return new Promise((resolve) => {
+            // Prevent double-opening
+            if (this.isShowing) {
+                console.warn('Modal is already showing, ignoring duplicate request');
+                resolve(null);
+                return;
+            }
+
+            this.isShowing = true;
+            this.currentResolver = resolve;
+            this.titleElement.textContent = title;
+            this.messageElement.textContent = message;
+            this.inputElement.style.display = 'block';
+            this.inputElement.value = defaultValue;
+
+            // Reset button to primary style for prompts
+            this.confirmButton.className = 'btn-flat btn-flat-primary';
+            this.confirmButton.innerHTML = '<i class="bi bi-check-circle"></i> OK';
+
+            // Set up event handlers
+            this.confirmButton.onclick = (e) => {
+                e.preventDefault();
+                e.stopPropagation();
+                this._handleConfirm(true);
+            };
+
+            // Handle Enter key in input
+            this.inputElement.onkeydown = (e) => {
+                if (e.key === 'Enter') {
+                    e.preventDefault();
+                    this._handleConfirm(true);
+                }
+            };
+
+            // Handle modal hidden event for cleanup
+            this.modalElement.addEventListener('hidden.bs.modal', () => {
+                if (this.currentResolver) {
+                    this._handleCancel();
+                }
+            }, { once: true });
+
+            // Remove aria-hidden before showing to prevent accessibility warning
+            this.modalElement.removeAttribute('aria-hidden');
+
+            this.modal.show();
+
+            // Focus and select input after modal is shown
+            this.modalElement.addEventListener('shown.bs.modal', () => {
+                this.inputElement.focus();
+                this.inputElement.select();
+            }, { once: true });
         });
     }
 
     _handleConfirm(isPrompt) {
         if (this.currentResolver) {
-            const value = isPrompt ? this.inputElement.value : true;
-            this.currentResolver(value);
+            const value = isPrompt ? this.inputElement.value.trim() : true;
+            const resolver = this.currentResolver;
             this._cleanup();
+            resolver(value);
         }
     }
 
     _handleCancel() {
         if (this.currentResolver) {
-            this.currentResolver(null); // Resolve with null for cancellation
+            const resolver = this.currentResolver;
             this._cleanup();
+            resolver(null);
         }
     }
 
     _cleanup() {
         this.confirmButton.onclick = null;
-        this.modal.hide();
+        this.inputElement.onkeydown = null;
         this.currentResolver = null;
-    }
+        this.isShowing = false;
+        this.modal.hide();
 
-    confirm(message, title = 'Confirmation') {
-        return this._show(message, title, false);
-    }
-
-    prompt(message, defaultValue = '', title = 'Prompt') {
-        return this._show(message, title, true, defaultValue);
+        // Restore aria-hidden after modal is hidden
+        this.modalElement.addEventListener('hidden.bs.modal', () => {
+            this.modalElement.setAttribute('aria-hidden', 'true');
+        }, { once: true });
     }
 }
 
 // Make it globally available
-window.ConfirmationManager = new Confirmation('confirmationModal');
+window.ConfirmationManager = new ModalManager('confirmationModal');
+window.ModalManager = window.ConfirmationManager; // Alias for clarity

static/js/context-menu.js

@@ -0,0 +1,89 @@
+/**
+ * Context Menu Module
+ * Handles the right-click context menu for file tree items
+ */
+
+/**
+ * Show context menu at specified position
+ * @param {number} x - X coordinate
+ * @param {number} y - Y coordinate
+ * @param {Object} target - Target object with path and isDir properties
+ */
+function showContextMenu(x, y, target) {
+    const menu = document.getElementById('contextMenu');
+    if (!menu) return;
+
+    // Store target data
+    menu.dataset.targetPath = target.path;
+    menu.dataset.targetIsDir = target.isDir;
+
+    // Show/hide menu items based on target type
+    const items = {
+        'new-file': target.isDir,
+        'new-folder': target.isDir,
+        'upload': target.isDir,
+        'download': true,
+        'paste': target.isDir && window.fileTreeActions?.clipboard,
+        'open': !target.isDir
+    };
+
+    Object.entries(items).forEach(([action, show]) => {
+        const item = menu.querySelector(`[data-action="${action}"]`);
+        if (item) {
+            item.style.display = show ? 'flex' : 'none';
+        }
+    });
+
+    // Position menu
+    menu.style.display = 'block';
+    menu.style.left = x + 'px';
+    menu.style.top = y + 'px';
+
+    // Adjust if off-screen
+    setTimeout(() => {
+        const rect = menu.getBoundingClientRect();
+        if (rect.right > window.innerWidth) {
+            menu.style.left = (window.innerWidth - rect.width - 10) + 'px';
+        }
+        if (rect.bottom > window.innerHeight) {
+            menu.style.top = (window.innerHeight - rect.height - 10) + 'px';
+        }
+    }, 0);
+}
+
+/**
+ * Hide the context menu
+ */
+function hideContextMenu() {
+    const menu = document.getElementById('contextMenu');
+    if (menu) {
+        menu.style.display = 'none';
+    }
+}
+
+// Combined click handler for context menu and outside clicks
+document.addEventListener('click', async (e) => {
+    const menuItem = e.target.closest('.context-menu-item');
+
+    if (menuItem) {
+        // Handle context menu item click
+        const action = menuItem.dataset.action;
+        const menu = document.getElementById('contextMenu');
+        const targetPath = menu.dataset.targetPath;
+        const isDir = menu.dataset.targetIsDir === 'true';
+
+        hideContextMenu();
+
+        if (window.fileTreeActions) {
+            await window.fileTreeActions.execute(action, targetPath, isDir);
+        }
+    } else if (!e.target.closest('#contextMenu') && !e.target.closest('.tree-node')) {
+        // Hide on outside click
+        hideContextMenu();
+    }
+});
+
+// Make functions globally available
+window.showContextMenu = showContextMenu;
+window.hideContextMenu = hideContextMenu;
+

static/js/dark-mode.js

@@ -0,0 +1,77 @@
+/**
+ * Dark Mode Module
+ * Manages dark mode theme switching and persistence
+ */
+
+class DarkMode {
+    constructor() {
+        this.isDark = localStorage.getItem(Config.STORAGE_KEYS.DARK_MODE) === 'true';
+        this.apply();
+    }
+
+    /**
+     * Toggle dark mode on/off
+     */
+    toggle() {
+        this.isDark = !this.isDark;
+        localStorage.setItem(Config.STORAGE_KEYS.DARK_MODE, this.isDark);
+        this.apply();
+
+        Logger.debug(`Dark mode ${this.isDark ? 'enabled' : 'disabled'}`);
+    }
+
+    /**
+     * Apply the current dark mode state
+     */
+    apply() {
+        if (this.isDark) {
+            document.body.classList.add('dark-mode');
+            const btn = document.getElementById('darkModeBtn');
+            if (btn) btn.innerHTML = '<i class="bi bi-sun-fill"></i>';
+
+            // Update mermaid theme
+            if (window.mermaid) {
+                mermaid.initialize({ theme: Config.MERMAID_THEME_DARK });
+            }
+        } else {
+            document.body.classList.remove('dark-mode');
+            const btn = document.getElementById('darkModeBtn');
+            if (btn) btn.innerHTML = '<i class="bi bi-moon-fill"></i>';
+
+            // Update mermaid theme
+            if (window.mermaid) {
+                mermaid.initialize({ theme: Config.MERMAID_THEME_LIGHT });
+            }
+        }
+    }
+
+    /**
+     * Check if dark mode is currently enabled
+     * @returns {boolean} True if dark mode is enabled
+     */
+    isEnabled() {
+        return this.isDark;
+    }
+
+    /**
+     * Enable dark mode
+     */
+    enable() {
+        if (!this.isDark) {
+            this.toggle();
+        }
+    }
+
+    /**
+     * Disable dark mode
+     */
+    disable() {
+        if (this.isDark) {
+            this.toggle();
+        }
+    }
+}
+
+// Make DarkMode globally available
+window.DarkMode = DarkMode;
+

static/js/editor-drop-handler.js

@@ -0,0 +1,67 @@
+/**
+ * Editor Drop Handler Module
+ * Handles file drops into the editor for uploading
+ */
+
+class EditorDropHandler {
+    constructor(editorElement, onFileDrop) {
+        this.editorElement = editorElement;
+        this.onFileDrop = onFileDrop;
+        this.setupHandlers();
+    }
+
+    /**
+     * Setup drag and drop event handlers
+     */
+    setupHandlers() {
+        this.editorElement.addEventListener('dragover', (e) => {
+            e.preventDefault();
+            e.stopPropagation();
+            this.editorElement.classList.add('drag-over');
+        });
+
+        this.editorElement.addEventListener('dragleave', (e) => {
+            e.preventDefault();
+            e.stopPropagation();
+            this.editorElement.classList.remove('drag-over');
+        });
+
+        this.editorElement.addEventListener('drop', async (e) => {
+            e.preventDefault();
+            e.stopPropagation();
+            this.editorElement.classList.remove('drag-over');
+
+            const files = Array.from(e.dataTransfer.files);
+            if (files.length === 0) return;
+
+            Logger.debug(`Dropped ${files.length} file(s) into editor`);
+
+            for (const file of files) {
+                try {
+                    if (this.onFileDrop) {
+                        await this.onFileDrop(file);
+                    }
+                } catch (error) {
+                    Logger.error('Drop failed:', error);
+                    if (window.showNotification) {
+                        window.showNotification(`Failed to upload ${file.name}`, 'error');
+                    }
+                }
+            }
+        });
+    }
+
+    /**
+     * Remove event handlers
+     */
+    destroy() {
+        // Note: We can't easily remove the event listeners without keeping references
+        // This is a limitation of the current implementation
+        // In a future refactor, we could store the bound handlers
+        Logger.debug('EditorDropHandler destroyed');
+    }
+}
+
+// Make EditorDropHandler globally available
+window.EditorDropHandler = EditorDropHandler;
+

static/js/editor.js

@@ -4,15 +4,26 @@
  */
 
 class MarkdownEditor {
-    constructor(editorId, previewId, filenameInputId) {
+    constructor(editorId, previewId, filenameInputId, readOnly = false) {
         this.editorElement = document.getElementById(editorId);
         this.previewElement = document.getElementById(previewId);
         this.filenameInput = document.getElementById(filenameInputId);
         this.currentFile = null;
         this.webdavClient = null;
         this.macroProcessor = new MacroProcessor(null); // Will be set later
+        this.lastViewedStorageKey = 'lastViewedPage'; // localStorage key for tracking last viewed page
+        this.readOnly = readOnly; // Whether editor is in read-only mode
+        this.editor = null; // Will be initialized later
+        this.isShowingCustomPreview = false; // Flag to prevent auto-update when showing binary files
 
+        // Initialize loading spinners (will be created lazily when needed)
+        this.editorSpinner = null;
+        this.previewSpinner = null;
+
+        // Only initialize CodeMirror if not in read-only mode (view mode)
+        if (!readOnly) {
             this.initCodeMirror();
+        }
         this.initMarkdown();
         this.initMermaid();
     }
@@ -21,22 +32,27 @@ class MarkdownEditor {
      * Initialize CodeMirror
      */
     initCodeMirror() {
+        // Determine theme based on dark mode
+        const isDarkMode = document.body.classList.contains('dark-mode');
+        const theme = isDarkMode ? 'monokai' : 'default';
+
         this.editor = CodeMirror(this.editorElement, {
             mode: 'markdown',
-            theme: 'monokai',
+            theme: theme,
             lineNumbers: true,
             lineWrapping: true,
-            autofocus: true,
-            extraKeys: {
+            autofocus: !this.readOnly, // Don't autofocus in read-only mode
+            readOnly: this.readOnly, // Set read-only mode
+            extraKeys: this.readOnly ? {} : {
                 'Ctrl-S': () => this.save(),
                 'Cmd-S': () => this.save()
             }
         });
 
         // Update preview on change with debouncing
-        this.editor.on('change', this.debounce(() => {
+        this.editor.on('change', TimingUtils.debounce(() => {
             this.updatePreview();
-        }, 300));
+        }, Config.DEBOUNCE_DELAY));
 
         // Initial preview render
         setTimeout(() => {
@@ -47,6 +63,27 @@ class MarkdownEditor {
         this.editor.on('scroll', () => {
             this.syncScroll();
         });
+
+        // Listen for dark mode changes
+        this.setupThemeListener();
+    }
+
+    /**
+     * Setup listener for dark mode changes
+     */
+    setupThemeListener() {
+        // Watch for dark mode class changes
+        const observer = new MutationObserver((mutations) => {
+            mutations.forEach((mutation) => {
+                if (mutation.attributeName === 'class') {
+                    const isDarkMode = document.body.classList.contains('dark-mode');
+                    const newTheme = isDarkMode ? 'monokai' : 'default';
+                    this.editor.setOption('theme', newTheme);
+                }
+            });
+        });
+
+        observer.observe(document.body, { attributes: true });
     }
 
     /**
@@ -55,9 +92,88 @@ class MarkdownEditor {
     initMarkdown() {
         if (window.marked) {
             this.marked = window.marked;
+
+            // Create custom renderer for images
+            const renderer = new marked.Renderer();
+
+            renderer.image = (token) => {
+                // Handle both old API (string params) and new API (token object)
+                let href, title, text;
+
+                if (typeof token === 'object' && token !== null) {
+                    // New API: token is an object
+                    href = token.href || '';
+                    title = token.title || '';
+                    text = token.text || '';
+                } else {
+                    // Old API: separate parameters (href, title, text)
+                    href = arguments[0] || '';
+                    title = arguments[1] || '';
+                    text = arguments[2] || '';
+                }
+
+                // Ensure all are strings
+                href = String(href || '');
+                title = String(title || '');
+                text = String(text || '');
+
+                Logger.debug(`Image renderer called with href="${href}", title="${title}", text="${text}"`);
+
+                // Check if href contains binary data (starts with non-printable characters)
+                if (href && href.length > 100 && /^[\x00-\x1F\x7F-\xFF]/.test(href)) {
+                    Logger.error('Image href contains binary data - this should not happen!');
+                    Logger.error('First 50 chars:', href.substring(0, 50));
+                    // Return a placeholder image
+                    return `<div class="alert alert-warning">⚠️ Invalid image data detected. Please re-upload the image.</div>`;
+                }
+
+                // Fix relative image paths to use WebDAV base URL
+                if (href && !href.startsWith('http://') && !href.startsWith('https://') && !href.startsWith('data:')) {
+                    // Get the directory of the current file
+                    const currentDir = this.currentFile ? PathUtils.getParentPath(this.currentFile) : '';
+
+                    // Resolve relative path
+                    let imagePath = href;
+                    if (href.startsWith('./')) {
+                        // Relative to current directory
+                        imagePath = PathUtils.joinPaths(currentDir, href.substring(2));
+                    } else if (href.startsWith('../')) {
+                        // Relative to parent directory
+                        imagePath = PathUtils.joinPaths(currentDir, href);
+                    } else if (!href.startsWith('/')) {
+                        // Relative to current directory (no ./)
+                        imagePath = PathUtils.joinPaths(currentDir, href);
+                    } else {
+                        // Absolute path from collection root
+                        imagePath = href.substring(1); // Remove leading /
+                    }
+
+                    // Build WebDAV URL - ensure no double slashes
+                    if (this.webdavClient && this.webdavClient.currentCollection) {
+                        // Remove trailing slash from baseUrl if present
+                        const baseUrl = this.webdavClient.baseUrl.endsWith('/')
+                            ? this.webdavClient.baseUrl.slice(0, -1)
+                            : this.webdavClient.baseUrl;
+
+                        // Ensure imagePath doesn't start with /
+                        const cleanImagePath = imagePath.startsWith('/') ? imagePath.substring(1) : imagePath;
+
+                        href = `${baseUrl}/${this.webdavClient.currentCollection}/${cleanImagePath}`;
+
+                        Logger.debug(`Resolved image URL: ${href}`);
+                    }
+                }
+
+                // Generate HTML directly
+                const titleAttr = title ? ` title="${title}"` : '';
+                const altAttr = text ? ` alt="${text}"` : '';
+                return `<img src="${href}"${altAttr}${titleAttr}>`;
+            };
+
             this.marked.setOptions({
                 breaks: true,
                 gfm: true,
+                renderer: renderer,
                 highlight: (code, lang) => {
                     if (lang && window.Prism.languages[lang]) {
                         return window.Prism.highlight(code, window.Prism.languages[lang], lang);
@@ -94,21 +210,74 @@ class MarkdownEditor {
         }
     }
 
+    /**
+     * Initialize loading spinners (lazy initialization)
+     */
+    initLoadingSpinners() {
+        if (!this.editorSpinner && !this.readOnly && this.editorElement) {
+            this.editorSpinner = new LoadingSpinner(this.editorElement, 'Loading file...');
+        }
+        if (!this.previewSpinner && this.previewElement) {
+            this.previewSpinner = new LoadingSpinner(this.previewElement, 'Rendering preview...');
+        }
+    }
+
     /**
      * Load file
      */
     async loadFile(path) {
         try {
+            // Initialize loading spinners if not already done
+            this.initLoadingSpinners();
+
+            // Show loading spinners
+            if (this.editorSpinner) {
+                this.editorSpinner.show('Loading file...');
+            }
+            if (this.previewSpinner) {
+                this.previewSpinner.show('Loading preview...');
+            }
+
+            // Reset custom preview flag when loading text files
+            this.isShowingCustomPreview = false;
+
             const content = await this.webdavClient.get(path);
             this.currentFile = path;
-            this.filenameInput.value = path;
-            this.editor.setValue(content);
-            this.updatePreview();
 
-            if (window.showNotification) {
-                window.showNotification(`Loaded ${path}`, 'info');
+            // Update filename input if it exists
+            if (this.filenameInput) {
+                this.filenameInput.value = path;
             }
+
+            // Update editor if it exists (edit mode)
+            if (this.editor) {
+                this.editor.setValue(content);
+            }
+
+            // Update preview with the loaded content
+            await this.renderPreview(content);
+
+            // Save as last viewed page
+            this.saveLastViewedPage(path);
+
+            // Hide loading spinners
+            if (this.editorSpinner) {
+                this.editorSpinner.hide();
+            }
+            if (this.previewSpinner) {
+                this.previewSpinner.hide();
+            }
+
+            // No notification for successful file load - it's not critical
         } catch (error) {
+            // Hide loading spinners on error
+            if (this.editorSpinner) {
+                this.editorSpinner.hide();
+            }
+            if (this.previewSpinner) {
+                this.previewSpinner.hide();
+            }
+
             console.error('Failed to load file:', error);
             if (window.showNotification) {
                 window.showNotification('Failed to load file', 'danger');
@@ -116,6 +285,32 @@ class MarkdownEditor {
         }
     }
 
+    /**
+     * Save the last viewed page to localStorage
+     * Stores per collection so different collections can have different last viewed pages
+     */
+    saveLastViewedPage(path) {
+        if (!this.webdavClient || !this.webdavClient.currentCollection) {
+            return;
+        }
+        const collection = this.webdavClient.currentCollection;
+        const storageKey = `${this.lastViewedStorageKey}:${collection}`;
+        localStorage.setItem(storageKey, path);
+    }
+
+    /**
+     * Get the last viewed page from localStorage
+     * Returns null if no page was previously viewed
+     */
+    getLastViewedPage() {
+        if (!this.webdavClient || !this.webdavClient.currentCollection) {
+            return null;
+        }
+        const collection = this.webdavClient.currentCollection;
+        const storageKey = `${this.lastViewedStorageKey}:${collection}`;
+        return localStorage.getItem(storageKey);
+    }
+
     /**
      * Save file
      */
@@ -159,10 +354,7 @@ class MarkdownEditor {
         this.filenameInput.focus();
         this.editor.setValue('# New File\n\nStart typing...\n');
         this.updatePreview();
-
-        if (window.showNotification) {
-            window.showNotification('Enter filename and start typing', 'info');
-        }
+        // No notification needed - UI is self-explanatory
     }
 
     /**
@@ -174,7 +366,7 @@ class MarkdownEditor {
             return;
         }
 
-        const confirmed = await window.ConfirmationManager.confirm(`Are you sure you want to delete ${this.currentFile}?`, 'Delete File');
+        const confirmed = await window.ConfirmationManager.confirm(`Are you sure you want to delete ${this.currentFile}?`, 'Delete File', true);
         if (confirmed) {
             try {
                 await this.webdavClient.delete(this.currentFile);
@@ -189,10 +381,66 @@ class MarkdownEditor {
     }
 
     /**
-     * Update preview
+     * Convert JSX-style attributes to HTML attributes
+     * Handles style={{...}} and boolean attributes like allowFullScreen={true}
      */
-    async updatePreview() {
-        const markdown = this.editor.getValue();
+    convertJSXToHTML(content) {
+        Logger.debug('Converting JSX to HTML...');
+
+        // Convert style={{...}} to style="..."
+        // This regex finds style={{...}} and converts the object notation to CSS string
+        content = content.replace(/style=\{\{([^}]+)\}\}/g, (match, styleContent) => {
+            Logger.debug(`Found JSX style: ${match}`);
+
+            // Parse the object-like syntax and convert to CSS
+            const cssRules = styleContent
+                .split(',')
+                .map(rule => {
+                    const colonIndex = rule.indexOf(':');
+                    if (colonIndex === -1) return '';
+
+                    const key = rule.substring(0, colonIndex).trim();
+                    const value = rule.substring(colonIndex + 1).trim();
+
+                    if (!key || !value) return '';
+
+                    // Convert camelCase to kebab-case (e.g., paddingTop -> padding-top)
+                    const cssKey = key.replace(/([A-Z])/g, '-$1').toLowerCase();
+
+                    // Remove quotes from value
+                    let cssValue = value.replace(/^['"]|['"]$/g, '');
+
+                    return `${cssKey}: ${cssValue}`;
+                })
+                .filter(rule => rule)
+                .join('; ');
+
+            Logger.debug(`Converted to CSS: style="${cssRules}"`);
+            return `style="${cssRules}"`;
+        });
+
+        // Convert boolean attributes like allowFullScreen={true} to allowfullscreen
+        content = content.replace(/(\w+)=\{true\}/g, (match, attrName) => {
+            Logger.debug(`Found boolean attribute: ${match}`);
+            // Convert camelCase to lowercase for HTML attributes
+            const htmlAttr = attrName.toLowerCase();
+            Logger.debug(`Converted to: ${htmlAttr}`);
+            return htmlAttr;
+        });
+
+        // Remove attributes set to {false}
+        content = content.replace(/\s+\w+=\{false\}/g, '');
+
+        return content;
+    }
+
+    /**
+     * Render preview from markdown content
+     * Can be called with explicit content (for view mode) or from editor (for edit mode)
+     */
+    async renderPreview(markdownContent = null) {
+        // Get markdown content from editor if not provided
+        const markdown = markdownContent !== null ? markdownContent : (this.editor ? this.editor.getValue() : '');
         const previewDiv = this.previewElement;
 
         if (!markdown || !markdown.trim()) {
@@ -205,23 +453,30 @@ class MarkdownEditor {
         }
 
         try {
-            // Step 1: Process macros
-            let processedContent = markdown;
+            // Initialize loading spinners if not already done
+            this.initLoadingSpinners();
 
-            if (this.macroProcessor) {
-                const processingResult = await this.macroProcessor.processMacros(markdown);
-                processedContent = processingResult.content;
-                
-                // Log errors if any
-                if (processingResult.errors.length > 0) {
-                    console.warn('Macro processing errors:', processingResult.errors);
+            // Show preview loading spinner (only if not already shown by loadFile)
+            if (this.previewSpinner && !this.previewSpinner.isVisible()) {
+                this.previewSpinner.show('Rendering preview...');
             }
+
+            // Step 0: Convert JSX-style syntax to HTML
+            let processedContent = this.convertJSXToHTML(markdown);
+
+            // Step 1: Process macros
+            if (this.macroProcessor) {
+                const processingResult = await this.macroProcessor.processMacros(processedContent);
+                processedContent = processingResult.content;
             }
 
             // Step 2: Parse markdown to HTML
             if (!this.marked) {
                 console.error("Markdown parser (marked) not initialized.");
                 previewDiv.innerHTML = `<div class="alert alert-danger">Preview engine not loaded.</div>`;
+                if (this.previewSpinner) {
+                    this.previewSpinner.hide();
+                }
                 return;
             }
 
@@ -259,6 +514,13 @@ class MarkdownEditor {
                     console.warn('Mermaid rendering error:', error);
                 }
             }
+
+            // Hide preview loading spinner after a small delay to ensure rendering is complete
+            setTimeout(() => {
+                if (this.previewSpinner) {
+                    this.previewSpinner.hide();
+                }
+            }, 100);
         } catch (error) {
             console.error('Preview rendering error:', error);
             previewDiv.innerHTML = `
@@ -267,6 +529,27 @@ class MarkdownEditor {
                     ${error.message}
                 </div>
             `;
+
+            // Hide loading spinner on error
+            if (this.previewSpinner) {
+                this.previewSpinner.hide();
+            }
+        }
+    }
+
+    /**
+     * Update preview (backward compatibility wrapper)
+     * Calls renderPreview with content from editor
+     */
+    async updatePreview() {
+        // Skip auto-update if showing custom preview (e.g., binary files)
+        if (this.isShowingCustomPreview) {
+            Logger.debug('Skipping auto-update: showing custom preview');
+            return;
+        }
+
+        if (this.editor) {
+            await this.renderPreview();
         }
     }
 
@@ -274,6 +557,8 @@ class MarkdownEditor {
      * Sync scroll between editor and preview
      */
     syncScroll() {
+        if (!this.editor) return; // Skip if no editor (view mode)
+
         const scrollInfo = this.editor.getScrollInfo();
         const scrollPercent = scrollInfo.top / (scrollInfo.height - scrollInfo.clientHeight);
 
@@ -324,20 +609,7 @@ class MarkdownEditor {
         this.editor.setValue(content);
     }
 
-    /**
-     * Debounce function
-     */
-    debounce(func, wait) {
-        let timeout;
-        return function executedFunction(...args) {
-            const later = () => {
-                clearTimeout(timeout);
-                func(...args);
-            };
-            clearTimeout(timeout);
-            timeout = setTimeout(later, wait);
-        };
-    }
+    // Debounce function moved to TimingUtils in utils.js
 }
 
 // Export for use in other modules

static/js/event-bus.js

@@ -0,0 +1,126 @@
+/**
+ * Event Bus Module
+ * Provides a centralized event system for application-wide communication
+ * Allows components to communicate without tight coupling
+ */
+
+class EventBus {
+    constructor() {
+        /**
+         * Map of event names to arrays of listener functions
+         * @type {Object.<string, Function[]>}
+         */
+        this.listeners = {};
+    }
+
+    /**
+     * Register an event listener
+     * @param {string} event - The event name to listen for
+     * @param {Function} callback - The function to call when the event is dispatched
+     * @returns {Function} A function to unregister this listener
+     */
+    on(event, callback) {
+        if (!this.listeners[event]) {
+            this.listeners[event] = [];
+        }
+        this.listeners[event].push(callback);
+
+        // Return unsubscribe function
+        return () => this.off(event, callback);
+    }
+
+    /**
+     * Register a one-time event listener
+     * The listener will be automatically removed after being called once
+     * @param {string} event - The event name to listen for
+     * @param {Function} callback - The function to call when the event is dispatched
+     * @returns {Function} A function to unregister this listener
+     */
+    once(event, callback) {
+        const onceWrapper = (data) => {
+            callback(data);
+            this.off(event, onceWrapper);
+        };
+        return this.on(event, onceWrapper);
+    }
+
+    /**
+     * Unregister an event listener
+     * @param {string} event - The event name
+     * @param {Function} callback - The callback function to remove
+     */
+    off(event, callback) {
+        if (!this.listeners[event]) {
+            return;
+        }
+
+        this.listeners[event] = this.listeners[event].filter(
+            listener => listener !== callback
+        );
+
+        // Clean up empty listener arrays
+        if (this.listeners[event].length === 0) {
+            delete this.listeners[event];
+        }
+    }
+
+    /**
+     * Dispatch an event to all registered listeners
+     * @param {string} event - The event name to dispatch
+     * @param {any} data - The data to pass to the listeners
+     */
+    dispatch(event, data) {
+        if (!this.listeners[event]) {
+            return;
+        }
+
+        // Create a copy of the listeners array to avoid issues if listeners are added/removed during dispatch
+        const listeners = [...this.listeners[event]];
+        
+        listeners.forEach(callback => {
+            try {
+                callback(data);
+            } catch (error) {
+                Logger.error(`Error in event listener for "${event}":`, error);
+            }
+        });
+    }
+
+    /**
+     * Remove all listeners for a specific event
+     * If no event is specified, removes all listeners for all events
+     * @param {string} [event] - The event name (optional)
+     */
+    clear(event) {
+        if (event) {
+            delete this.listeners[event];
+        } else {
+            this.listeners = {};
+        }
+    }
+
+    /**
+     * Get the number of listeners for an event
+     * @param {string} event - The event name
+     * @returns {number} The number of listeners
+     */
+    listenerCount(event) {
+        return this.listeners[event] ? this.listeners[event].length : 0;
+    }
+
+    /**
+     * Get all event names that have listeners
+     * @returns {string[]} Array of event names
+     */
+    eventNames() {
+        return Object.keys(this.listeners);
+    }
+}
+
+// Create and export the global event bus instance
+const eventBus = new EventBus();
+
+// Make it globally available
+window.eventBus = eventBus;
+window.EventBus = EventBus;
+

static/js/file-tree-actions.js

@@ -14,32 +14,10 @@ class FileTreeActions {
     /**
      * Validate and sanitize filename/folder name
      * Returns { valid: boolean, sanitized: string, message: string }
+     * Now uses ValidationUtils from utils.js
      */
     validateFileName(name, isFolder = false) {
-        const type = isFolder ? 'folder' : 'file';
-        
-        if (!name || name.trim().length === 0) {
-            return { valid: false, message: `${type} name cannot be empty` };
-        }
-        
-        // Check for invalid characters
-        const validPattern = /^[a-z0-9_]+(\.[a-z0-9_]+)*$/;
-        
-        if (!validPattern.test(name)) {
-            const sanitized = name
-                .toLowerCase()
-                .replace(/[^a-z0-9_.]/g, '_')
-                .replace(/_+/g, '_')
-                .replace(/^_+|_+$/g, '');
-            
-            return {
-                valid: false,
-                sanitized,
-                message: `Invalid characters in ${type} name. Only lowercase letters, numbers, and underscores allowed.\n\nSuggestion: "${sanitized}"`
-            };
-        }
-        
-        return { valid: true, sanitized: name, message: '' };
+        return ValidationUtils.validateFileName(name, isFolder);
     }
 
     async execute(action, targetPath, isDirectory) {
@@ -58,18 +36,24 @@ class FileTreeActions {
     }
 
     actions = {
-        open: async function(path, isDir) {
+        open: async function (path, isDir) {
             if (!isDir) {
                 await this.editor.loadFile(path);
             }
         },
 
-        'new-file': async function(path, isDir) {
+        'new-file': async function (path, isDir) {
             if (!isDir) return;
 
-            await this.showInputDialog('Enter filename (lowercase, underscore only):', 'new_file.md', async (filename) => {
+            const filename = await window.ModalManager.prompt(
+                'Enter filename (lowercase, underscore only):',
+                'new_file.md',
+                'New File'
+            );
+
             if (!filename) return;
 
+            let finalFilename = filename;
             const validation = this.validateFileName(filename, false);
 
             if (!validation.valid) {
@@ -77,8 +61,13 @@ class FileTreeActions {
 
                 // Ask if user wants to use sanitized version
                 if (validation.sanitized) {
-                        if (await this.showConfirmDialog('Use sanitized name?', `${filename} → ${validation.sanitized}`)) {
-                            filename = validation.sanitized;
+                    const useSanitized = await window.ModalManager.confirm(
+                        `${filename} → ${validation.sanitized}`,
+                        'Use sanitized name?',
+                        false
+                    );
+                    if (useSanitized) {
+                        finalFilename = validation.sanitized;
                     } else {
                         return;
                     }
@@ -87,28 +76,44 @@ class FileTreeActions {
                 }
             }
 
-                const fullPath = `${path}/${filename}`.replace(/\/+/g, '/');
+            const fullPath = `${path}/${finalFilename}`.replace(/\/+/g, '/');
             await this.webdavClient.put(fullPath, '# New File\n\n');
+
+            // Clear undo history since new file was created
+            if (this.fileTree.lastMoveOperation) {
+                this.fileTree.lastMoveOperation = null;
+            }
+
             await this.fileTree.load();
-                showNotification(`Created ${filename}`, 'success');
+            showNotification(`Created ${finalFilename}`, 'success');
             await this.editor.loadFile(fullPath);
-            });
         },
 
-        'new-folder': async function(path, isDir) {
+        'new-folder': async function (path, isDir) {
             if (!isDir) return;
 
-            await this.showInputDialog('Enter folder name (lowercase, underscore only):', 'new_folder', async (foldername) => {
+            const foldername = await window.ModalManager.prompt(
+                'Enter folder name (lowercase, underscore only):',
+                'new_folder',
+                'New Folder'
+            );
+
             if (!foldername) return;
 
+            let finalFoldername = foldername;
             const validation = this.validateFileName(foldername, true);
 
             if (!validation.valid) {
                 showNotification(validation.message, 'warning');
 
                 if (validation.sanitized) {
-                        if (await this.showConfirmDialog('Use sanitized name?', `${foldername} → ${validation.sanitized}`)) {
-                            foldername = validation.sanitized;
+                    const useSanitized = await window.ModalManager.confirm(
+                        `${foldername} → ${validation.sanitized}`,
+                        'Use sanitized name?',
+                        false
+                    );
+                    if (useSanitized) {
+                        finalFoldername = validation.sanitized;
                     } else {
                         return;
                     }
@@ -117,38 +122,54 @@ class FileTreeActions {
                 }
             }
 
-                const fullPath = `${path}/${foldername}`.replace(/\/+/g, '/');
+            const fullPath = `${path}/${finalFoldername}`.replace(/\/+/g, '/');
             await this.webdavClient.mkcol(fullPath);
+
+            // Clear undo history since new folder was created
+            if (this.fileTree.lastMoveOperation) {
+                this.fileTree.lastMoveOperation = null;
+            }
+
             await this.fileTree.load();
-                showNotification(`Created folder ${foldername}`, 'success');
-            });
+            showNotification(`Created folder ${finalFoldername}`, 'success');
         },
 
-        rename: async function(path, isDir) {
+        rename: async function (path, isDir) {
             const oldName = path.split('/').pop();
-            const newName = await this.showInputDialog('Rename to:', oldName);
+            const newName = await window.ModalManager.prompt(
+                'Rename to:',
+                oldName,
+                'Rename'
+            );
+
             if (newName && newName !== oldName) {
                 const parentPath = path.substring(0, path.lastIndexOf('/'));
                 const newPath = parentPath ? `${parentPath}/${newName}` : newName;
                 await this.webdavClient.move(path, newPath);
+
+                // Clear undo history since manual rename occurred
+                if (this.fileTree.lastMoveOperation) {
+                    this.fileTree.lastMoveOperation = null;
+                }
+
                 await this.fileTree.load();
                 showNotification('Renamed', 'success');
             }
         },
 
-        copy: async function(path, isDir) {
+        copy: async function (path, isDir) {
             this.clipboard = { path, operation: 'copy', isDirectory: isDir };
-            showNotification(`Copied: ${path.split('/').pop()}`, 'info');
+            // No notification for copy - it's a quick operation
             this.updatePasteMenuItem();
         },
 
-        cut: async function(path, isDir) {
+        cut: async function (path, isDir) {
             this.clipboard = { path, operation: 'cut', isDirectory: isDir };
-            showNotification(`Cut: ${path.split('/').pop()}`, 'warning');
+            // No notification for cut - it's a quick operation
             this.updatePasteMenuItem();
         },
 
-        paste: async function(targetPath, isDir) {
+        paste: async function (targetPath, isDir) {
             if (!this.clipboard || !isDir) return;
 
             const itemName = this.clipboard.path.split('/').pop();
@@ -156,36 +177,87 @@ class FileTreeActions {
 
             if (this.clipboard.operation === 'copy') {
                 await this.webdavClient.copy(this.clipboard.path, destPath);
-                showNotification('Copied', 'success');
+                // No notification for paste - file tree updates show the result
             } else {
                 await this.webdavClient.move(this.clipboard.path, destPath);
                 this.clipboard = null;
                 this.updatePasteMenuItem();
-                showNotification('Moved', 'success');
+                // No notification for move - file tree updates show the result
             }
 
             await this.fileTree.load();
         },
 
-        delete: async function(path, isDir) {
-            const name = path.split('/').pop();
+        delete: async function (path, isDir) {
+            const name = path.split('/').pop() || this.webdavClient.currentCollection;
             const type = isDir ? 'folder' : 'file';
 
-            if (!await this.showConfirmDialog(`Delete this ${type}?`, `${name}`)) {
-                return;
+            // Check if this is a root-level collection (empty path or single-level path)
+            const pathParts = path.split('/').filter(p => p.length > 0);
+            const isCollection = pathParts.length === 0;
+
+            if (isCollection) {
+                // Deleting a collection - use backend API
+                const confirmed = await window.ModalManager.confirm(
+                    `Are you sure you want to delete the collection "${name}"? This will delete all files and folders in it.`,
+                    'Delete Collection?',
+                    true
+                );
+
+                if (!confirmed) return;
+
+                try {
+                    // Call backend API to delete collection
+                    const response = await fetch(`/api/collections/${name}`, {
+                        method: 'DELETE'
+                    });
+
+                    if (!response.ok) {
+                        const error = await response.text();
+                        throw new Error(error || 'Failed to delete collection');
                     }
 
+                    showNotification(`Collection "${name}" deleted successfully`, 'success');
+
+                    // Reload the page to refresh collections list
+                    window.location.href = '/';
+                } catch (error) {
+                    Logger.error('Failed to delete collection:', error);
+                    showNotification(`Failed to delete collection: ${error.message}`, 'error');
+                }
+            } else {
+                // Deleting a regular file/folder - use WebDAV
+                const confirmed = await window.ModalManager.confirm(
+                    `Are you sure you want to delete ${name}?`,
+                    `Delete this ${type}?`,
+                    true
+                );
+
+                if (!confirmed) return;
+
                 await this.webdavClient.delete(path);
+
+                // Clear undo history since manual delete occurred
+                if (this.fileTree.lastMoveOperation) {
+                    this.fileTree.lastMoveOperation = null;
+                }
+
                 await this.fileTree.load();
                 showNotification(`Deleted ${name}`, 'success');
+            }
         },
 
-        download: async function(path, isDir) {
-            showNotification('Downloading...', 'info');
-            // Implementation here
+        download: async function (path, isDir) {
+            Logger.info(`Downloading ${isDir ? 'folder' : 'file'}: ${path}`);
+
+            if (isDir) {
+                await this.fileTree.downloadFolder(path);
+            } else {
+                await this.fileTree.downloadFile(path);
+            }
         },
 
-        upload: async function(path, isDir) {
+        upload: async function (path, isDir) {
             if (!isDir) return;
 
             const input = document.createElement('input');
@@ -204,154 +276,60 @@ class FileTreeActions {
             };
 
             input.click();
+        },
+
+        'copy-to-collection': async function (path, isDir) {
+            // Get list of available collections
+            const collections = await this.webdavClient.getCollections();
+            const currentCollection = this.webdavClient.currentCollection;
+
+            // Filter out current collection
+            const otherCollections = collections.filter(c => c !== currentCollection);
+
+            if (otherCollections.length === 0) {
+                showNotification('No other collections available', 'warning');
+                return;
+            }
+
+            // Show collection selection dialog
+            const targetCollection = await this.showCollectionSelectionDialog(
+                otherCollections,
+                `Copy ${PathUtils.getFileName(path)} to collection:`
+            );
+
+            if (!targetCollection) return;
+
+            // Copy the file/folder
+            await this.copyToCollection(path, isDir, currentCollection, targetCollection);
+        },
+
+        'move-to-collection': async function (path, isDir) {
+            // Get list of available collections
+            const collections = await this.webdavClient.getCollections();
+            const currentCollection = this.webdavClient.currentCollection;
+
+            // Filter out current collection
+            const otherCollections = collections.filter(c => c !== currentCollection);
+
+            if (otherCollections.length === 0) {
+                showNotification('No other collections available', 'warning');
+                return;
+            }
+
+            // Show collection selection dialog
+            const targetCollection = await this.showCollectionSelectionDialog(
+                otherCollections,
+                `Move ${PathUtils.getFileName(path)} to collection:`
+            );
+
+            if (!targetCollection) return;
+
+            // Move the file/folder
+            await this.moveToCollection(path, isDir, currentCollection, targetCollection);
         }
     };
 
-    // Modern dialog implementations
-    async showInputDialog(title, placeholder = '', callback) {
-        return new Promise((resolve) => {
-            const dialog = this.createInputDialog(title, placeholder);
-            const input = dialog.querySelector('input');
-            const confirmBtn = dialog.querySelector('.btn-primary');
-            const cancelBtn = dialog.querySelector('.btn-secondary');
-
-            const cleanup = (value) => {
-                const modalInstance = bootstrap.Modal.getInstance(dialog);
-                if (modalInstance) {
-                    modalInstance.hide();
-                }
-                dialog.remove();
-                const backdrop = document.querySelector('.modal-backdrop');
-                if (backdrop) backdrop.remove();
-                document.body.classList.remove('modal-open');
-                resolve(value);
-                if (callback) callback(value);
-            };
-
-            confirmBtn.onclick = () => {
-                cleanup(input.value.trim());
-            };
-
-            cancelBtn.onclick = () => {
-                cleanup(null);
-            };
-
-            dialog.addEventListener('hidden.bs.modal', () => {
-                cleanup(null);
-            });
-
-            input.onkeypress = (e) => {
-                if (e.key === 'Enter') confirmBtn.click();
-            };
-
-            document.body.appendChild(dialog);
-            const modal = new bootstrap.Modal(dialog);
-            modal.show();
-            input.focus();
-            input.select();
-        });
-    }
-
-    async showConfirmDialog(title, message = '', callback) {
-        return new Promise((resolve) => {
-            const dialog = this.createConfirmDialog(title, message);
-            const confirmBtn = dialog.querySelector('.btn-danger');
-            const cancelBtn = dialog.querySelector('.btn-secondary');
-
-            const cleanup = (value) => {
-                const modalInstance = bootstrap.Modal.getInstance(dialog);
-                if (modalInstance) {
-                    modalInstance.hide();
-                }
-                dialog.remove();
-                const backdrop = document.querySelector('.modal-backdrop');
-                if (backdrop) backdrop.remove();
-                document.body.classList.remove('modal-open');
-                resolve(value);
-                if (callback) callback(value);
-            };
-
-            confirmBtn.onclick = () => {
-                cleanup(true);
-            };
-
-            cancelBtn.onclick = () => {
-                cleanup(false);
-            };
-
-            dialog.addEventListener('hidden.bs.modal', () => {
-                cleanup(false);
-            });
-
-            document.body.appendChild(dialog);
-            const modal = new bootstrap.Modal(dialog);
-            modal.show();
-            confirmBtn.focus();
-        });
-    }
-
-    createInputDialog(title, placeholder) {
-        const backdrop = document.createElement('div');
-        backdrop.className = 'modal-backdrop fade show';
-        
-        const dialog = document.createElement('div');
-        dialog.className = 'modal fade show d-block';
-        dialog.setAttribute('tabindex', '-1');
-        dialog.style.display = 'block';
-        
-        dialog.innerHTML = `
-            <div class="modal-dialog modal-dialog-centered">
-                <div class="modal-content">
-                    <div class="modal-header">
-                        <h5 class="modal-title">${title}</h5>
-                        <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
-                    </div>
-                    <div class="modal-body">
-                        <input type="text" class="form-control" value="${placeholder}" autofocus>
-                    </div>
-                    <div class="modal-footer">
-                        <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Cancel</button>
-                        <button type="button" class="btn btn-primary">OK</button>
-                    </div>
-                </div>
-            </div>
-        `;
-        
-        document.body.appendChild(backdrop);
-        return dialog;
-    }
-
-    createConfirmDialog(title, message) {
-        const backdrop = document.createElement('div');
-        backdrop.className = 'modal-backdrop fade show';
-        
-        const dialog = document.createElement('div');
-        dialog.className = 'modal fade show d-block';
-        dialog.setAttribute('tabindex', '-1');
-        dialog.style.display = 'block';
-        
-        dialog.innerHTML = `
-            <div class="modal-dialog modal-dialog-centered">
-                <div class="modal-content">
-                    <div class="modal-header border-danger">
-                        <h5 class="modal-title text-danger">${title}</h5>
-                        <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
-                    </div>
-                    <div class="modal-body">
-                        <p>${message}</p>
-                        <p class="text-danger small">This action cannot be undone.</p>
-                    </div>
-                    <div class="modal-footer">
-                        <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Cancel</button>
-                        <button type="button" class="btn btn-danger">Delete</button>
-                    </div>
-                </div>
-            </div>
-        `;
-        
-        document.body.appendChild(backdrop);
-        return dialog;
-    }
+    // Old deprecated modal methods removed - all modals now use window.ModalManager
 
     updatePasteMenuItem() {
         const pasteItem = document.getElementById('pasteMenuItem');
@@ -359,4 +337,268 @@ class FileTreeActions {
             pasteItem.style.display = this.clipboard ? 'flex' : 'none';
         }
     }
+
+    /**
+     * Show a dialog to select a collection
+     * @param {Array<string>} collections - List of collection names
+     * @param {string} message - Dialog message
+     * @returns {Promise<string|null>} Selected collection or null if cancelled
+     */
+    async showCollectionSelectionDialog(collections, message) {
+        // Prevent duplicate modals
+        if (this._collectionModalShowing) {
+            Logger.warn('Collection selection modal is already showing');
+            return null;
+        }
+        this._collectionModalShowing = true;
+
+        // Create a custom modal with radio buttons for collection selection
+        const modal = document.createElement('div');
+        modal.className = 'modal fade';
+        modal.innerHTML = `
+            <div class="modal-dialog modal-dialog-centered">
+                <div class="modal-content">
+                    <div class="modal-header">
+                        <h5 class="modal-title"><i class="bi bi-folder-symlink"></i> Select Collection</h5>
+                        <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
+                    </div>
+                    <div class="modal-body">
+                        <p class="mb-3">${message}</p>
+                        <div class="collection-list" style="max-height: 300px; overflow-y: auto;">
+                            ${collections.map((c, i) => `
+                                <div class="form-check p-2 mb-2 rounded border collection-option" style="cursor: pointer; transition: all 0.2s;">
+                                    <input class="form-check-input" type="radio" name="collection" id="collection-${i}" value="${c}" ${i === 0 ? 'checked' : ''}>
+                                    <label class="form-check-label w-100" for="collection-${i}" style="cursor: pointer;">
+                                        <i class="bi bi-folder"></i> <strong>${c}</strong>
+                                    </label>
+                                </div>
+                            `).join('')}
+                        </div>
+                        <div id="confirmationPreview" class="alert alert-info mt-3" style="display: none;">
+                            <i class="bi bi-info-circle"></i> <span id="confirmationText"></span>
+                        </div>
+                    </div>
+                    <div class="modal-footer">
+                        <button type="button" class="btn-flat btn-flat-secondary" data-bs-dismiss="modal">
+                            <i class="bi bi-x-circle"></i> Cancel
+                        </button>
+                        <button type="button" class="btn-flat btn-flat-primary" id="confirmCollectionBtn">
+                            <i class="bi bi-check-circle"></i> OK
+                        </button>
+                    </div>
+                </div>
+            </div>
+        `;
+
+        document.body.appendChild(modal);
+        const bsModal = new bootstrap.Modal(modal);
+
+        // Extract file name and action from message
+        // Message format: "Copy filename to collection:" or "Move filename to collection:"
+        const messageMatch = message.match(/(Copy|Move)\s+(.+?)\s+to collection:/);
+        const action = messageMatch ? messageMatch[1].toLowerCase() : 'copy';
+        const fileName = messageMatch ? messageMatch[2] : 'item';
+
+        // Get confirmation preview elements
+        const confirmationPreview = modal.querySelector('#confirmationPreview');
+        const confirmationText = modal.querySelector('#confirmationText');
+
+        // Function to update confirmation message
+        const updateConfirmation = (collectionName) => {
+            confirmationText.textContent = `"${fileName}" will be ${action}d to "${collectionName}"`;
+            confirmationPreview.style.display = 'block';
+        };
+
+        // Add hover effects and click handlers for collection options
+        const collectionOptions = modal.querySelectorAll('.collection-option');
+        collectionOptions.forEach(option => {
+            // Hover effect
+            option.addEventListener('mouseenter', () => {
+                option.style.backgroundColor = 'var(--bs-light)';
+                option.style.borderColor = 'var(--bs-primary)';
+            });
+            option.addEventListener('mouseleave', () => {
+                const radio = option.querySelector('input[type="radio"]');
+                if (!radio.checked) {
+                    option.style.backgroundColor = '';
+                    option.style.borderColor = '';
+                }
+            });
+
+            // Click on the whole div to select
+            option.addEventListener('click', () => {
+                const radio = option.querySelector('input[type="radio"]');
+                radio.checked = true;
+
+                // Update confirmation message
+                updateConfirmation(radio.value);
+
+                // Update all options styling
+                collectionOptions.forEach(opt => {
+                    const r = opt.querySelector('input[type="radio"]');
+                    if (r.checked) {
+                        opt.style.backgroundColor = 'var(--bs-primary-bg-subtle)';
+                        opt.style.borderColor = 'var(--bs-primary)';
+                    } else {
+                        opt.style.backgroundColor = '';
+                        opt.style.borderColor = '';
+                    }
+                });
+            });
+
+            // Set initial styling for checked option
+            const radio = option.querySelector('input[type="radio"]');
+            if (radio.checked) {
+                option.style.backgroundColor = 'var(--bs-primary-bg-subtle)';
+                option.style.borderColor = 'var(--bs-primary)';
+                // Show initial confirmation
+                updateConfirmation(radio.value);
+            }
+        });
+
+        return new Promise((resolve) => {
+            const confirmBtn = modal.querySelector('#confirmCollectionBtn');
+
+            confirmBtn.addEventListener('click', () => {
+                const selected = modal.querySelector('input[name="collection"]:checked');
+                this._collectionModalShowing = false;
+                bsModal.hide();
+                resolve(selected ? selected.value : null);
+            });
+
+            modal.addEventListener('hidden.bs.modal', () => {
+                modal.remove();
+                this._collectionModalShowing = false;
+                resolve(null);
+            });
+
+            bsModal.show();
+        });
+    }
+
+    /**
+     * Copy a file or folder to another collection
+     */
+    async copyToCollection(path, isDir, sourceCollection, targetCollection) {
+        try {
+            Logger.info(`Copying ${path} from ${sourceCollection} to ${targetCollection}`);
+
+            if (isDir) {
+                // Copy folder recursively
+                await this.copyFolderToCollection(path, sourceCollection, targetCollection);
+            } else {
+                // Copy single file
+                await this.copyFileToCollection(path, sourceCollection, targetCollection);
+            }
+
+            showNotification(`Copied to ${targetCollection}`, 'success');
+        } catch (error) {
+            Logger.error('Failed to copy to collection:', error);
+            showNotification('Failed to copy to collection', 'error');
+            throw error;
+        }
+    }
+
+    /**
+     * Move a file or folder to another collection
+     */
+    async moveToCollection(path, isDir, sourceCollection, targetCollection) {
+        try {
+            Logger.info(`Moving ${path} from ${sourceCollection} to ${targetCollection}`);
+
+            // First copy
+            await this.copyToCollection(path, isDir, sourceCollection, targetCollection);
+
+            // Then delete from source
+            await this.webdavClient.delete(path);
+            await this.fileTree.load();
+
+            showNotification(`Moved to ${targetCollection}`, 'success');
+        } catch (error) {
+            Logger.error('Failed to move to collection:', error);
+            showNotification('Failed to move to collection', 'error');
+            throw error;
+        }
+    }
+
+    /**
+     * Copy a single file to another collection
+     */
+    async copyFileToCollection(path, sourceCollection, targetCollection) {
+        // Read file from source collection
+        const content = await this.webdavClient.get(path);
+
+        // Write to target collection
+        const originalCollection = this.webdavClient.currentCollection;
+        this.webdavClient.setCollection(targetCollection);
+
+        // Ensure parent directories exist in target collection
+        await this.webdavClient.ensureParentDirectories(path);
+
+        await this.webdavClient.put(path, content);
+        this.webdavClient.setCollection(originalCollection);
+    }
+
+    /**
+     * Copy a folder recursively to another collection
+     * @param {string} folderPath - Path of the folder to copy
+     * @param {string} sourceCollection - Source collection name
+     * @param {string} targetCollection - Target collection name
+     * @param {Set} visitedPaths - Set of already visited paths to prevent infinite loops
+     */
+    async copyFolderToCollection(folderPath, sourceCollection, targetCollection, visitedPaths = new Set()) {
+        // Prevent infinite loops by tracking visited paths
+        if (visitedPaths.has(folderPath)) {
+            Logger.warn(`Skipping already visited path: ${folderPath}`);
+            return;
+        }
+        visitedPaths.add(folderPath);
+
+        Logger.info(`Copying folder: ${folderPath} from ${sourceCollection} to ${targetCollection}`);
+
+        // Set to source collection to list items
+        const originalCollection = this.webdavClient.currentCollection;
+        this.webdavClient.setCollection(sourceCollection);
+
+        // Get only direct children (not recursive to avoid infinite loop)
+        const items = await this.webdavClient.list(folderPath, false);
+        Logger.debug(`Found ${items.length} items in ${folderPath}:`, items.map(i => i.path));
+
+        // Create the folder in target collection
+        this.webdavClient.setCollection(targetCollection);
+
+        try {
+            // Ensure parent directories exist first
+            await this.webdavClient.ensureParentDirectories(folderPath + '/dummy.txt');
+            // Then create the folder itself
+            await this.webdavClient.createFolder(folderPath);
+            Logger.debug(`Created folder: ${folderPath}`);
+        } catch (error) {
+            // Folder might already exist (405 Method Not Allowed), ignore error
+            if (error.message && error.message.includes('405')) {
+                Logger.debug(`Folder ${folderPath} already exists (405)`);
+            } else {
+                Logger.debug('Folder might already exist:', error);
+            }
+        }
+
+        // Copy all items
+        for (const item of items) {
+            if (item.isDirectory) {
+                // Recursively copy subdirectory
+                await this.copyFolderToCollection(item.path, sourceCollection, targetCollection, visitedPaths);
+            } else {
+                // Copy file
+                this.webdavClient.setCollection(sourceCollection);
+                const content = await this.webdavClient.get(item.path);
+                this.webdavClient.setCollection(targetCollection);
+                // Ensure parent directories exist before copying file
+                await this.webdavClient.ensureParentDirectories(item.path);
+                await this.webdavClient.put(item.path, content);
+                Logger.debug(`Copied file: ${item.path}`);
+            }
+        }
+
+        this.webdavClient.setCollection(originalCollection);
+    }
 }

static/js/file-tree.js

@@ -4,29 +4,48 @@
  */
 
 class FileTree {
-    constructor(containerId, webdavClient) {
+    constructor(containerId, webdavClient, isEditMode = false) {
         this.container = document.getElementById(containerId);
         this.webdavClient = webdavClient;
         this.tree = [];
         this.selectedPath = null;
         this.onFileSelect = null;
         this.onFolderSelect = null;
+        this.filterImagesInViewMode = !isEditMode; // Track if we should filter images (true in view mode)
+
+        // Drag and drop state
+        this.draggedNode = null;
+        this.draggedPath = null;
+        this.draggedIsDir = false;
+
+        // Long-press detection
+        this.longPressTimer = null;
+        this.longPressThreshold = Config.LONG_PRESS_THRESHOLD;
+        this.isDraggingEnabled = false;
+        this.mouseDownNode = null;
+
+        // Undo functionality
+        this.lastMoveOperation = null;
 
         this.setupEventListeners();
+        this.setupUndoListener();
     }
 
     setupEventListeners() {
         // Click handler for tree nodes
         this.container.addEventListener('click', (e) => {
-            console.log('Container clicked', e.target);
             const node = e.target.closest('.tree-node');
             if (!node) return;
 
-            console.log('Node found', node);
             const path = node.dataset.path;
             const isDir = node.dataset.isdir === 'true';
 
-            // The toggle is handled inside renderNodes now
+            // Check if toggle was clicked (icon or toggle button)
+            const toggle = e.target.closest('.tree-node-toggle');
+            if (toggle) {
+                // Toggle is handled by its own click listener in renderNodes
+                return;
+            }
 
             // Select node
             if (isDir) {
@@ -36,8 +55,18 @@ class FileTree {
             }
         });
 
-        // Context menu
+        // Context menu (only in edit mode)
         this.container.addEventListener('contextmenu', (e) => {
+            // Check if we're in edit mode
+            const isEditMode = document.body.classList.contains('edit-mode');
+
+            // In view mode, disable custom context menu entirely
+            if (!isEditMode) {
+                e.preventDefault(); // Prevent default browser context menu
+                return; // Don't show custom context menu
+            }
+
+            // Edit mode: show custom context menu
             const node = e.target.closest('.tree-node');
             e.preventDefault();
 
@@ -51,6 +80,333 @@ class FileTree {
                 window.showContextMenu(e.clientX, e.clientY, { path: '', isDir: true });
             }
         });
+
+        // Drag and drop event listeners (only in edit mode)
+        this.setupDragAndDrop();
+    }
+
+    setupUndoListener() {
+        // Listen for Ctrl+Z (Windows/Linux) or Cmd+Z (Mac)
+        document.addEventListener('keydown', async (e) => {
+            // Check for Ctrl+Z or Cmd+Z
+            const isUndo = (e.ctrlKey || e.metaKey) && e.key === 'z';
+
+            if (isUndo && this.isEditMode() && this.lastMoveOperation) {
+                e.preventDefault();
+                await this.undoLastMove();
+            }
+        });
+    }
+
+    async undoLastMove() {
+        if (!this.lastMoveOperation) {
+            return;
+        }
+
+        const { sourcePath, destPath, fileName, isDirectory } = this.lastMoveOperation;
+
+        try {
+            // Move the item back to its original location
+            await this.webdavClient.move(destPath, sourcePath);
+
+            // Get the parent folder name for the notification
+            const sourceParent = PathUtils.getParentPath(sourcePath);
+            const parentName = sourceParent ? sourceParent + '/' : 'root';
+
+            // Clear the undo history
+            this.lastMoveOperation = null;
+
+            // Reload the tree
+            await this.load();
+
+            // Re-select the moved item
+            this.selectAndExpandPath(sourcePath);
+
+            showNotification(`Undo: Moved ${fileName} back to ${parentName}`, 'success');
+        } catch (error) {
+            console.error('Failed to undo move:', error);
+            showNotification('Failed to undo move: ' + error.message, 'danger');
+        }
+    }
+
+    setupDragAndDrop() {
+        // Dragover event on container to allow dropping on root level
+        this.container.addEventListener('dragover', (e) => {
+            if (!this.isEditMode() || !this.draggedPath) return;
+
+            const node = e.target.closest('.tree-node');
+            if (!node) {
+                // Hovering over empty space (root level)
+                e.preventDefault();
+                e.dataTransfer.dropEffect = 'move';
+
+                // Highlight the entire container as a drop target
+                this.container.classList.add('drag-over-root');
+            }
+        });
+
+        // Dragleave event on container to remove root-level highlighting
+        this.container.addEventListener('dragleave', (e) => {
+            if (!this.isEditMode()) return;
+
+            // Only remove if we're actually leaving the container
+            // Check if the related target is outside the container
+            if (!this.container.contains(e.relatedTarget)) {
+                this.container.classList.remove('drag-over-root');
+            }
+        });
+
+        // Dragenter event to manage highlighting
+        this.container.addEventListener('dragenter', (e) => {
+            if (!this.isEditMode() || !this.draggedPath) return;
+
+            const node = e.target.closest('.tree-node');
+            if (!node) {
+                // Entering empty space
+                this.container.classList.add('drag-over-root');
+            } else {
+                // Entering a node, remove root highlighting
+                this.container.classList.remove('drag-over-root');
+            }
+        });
+
+        // Drop event on container for root level drops
+        this.container.addEventListener('drop', async (e) => {
+            if (!this.isEditMode()) return;
+
+            const node = e.target.closest('.tree-node');
+            if (!node && this.draggedPath) {
+                // Dropped on root level
+                e.preventDefault();
+                this.container.classList.remove('drag-over-root');
+                await this.handleDrop('', true);
+            }
+        });
+    }
+
+    isEditMode() {
+        return document.body.classList.contains('edit-mode');
+    }
+
+    setupNodeDragHandlers(nodeElement, node) {
+        // Dragstart - when user starts dragging
+        nodeElement.addEventListener('dragstart', (e) => {
+            this.draggedNode = nodeElement;
+            this.draggedPath = node.path;
+            this.draggedIsDir = node.isDirectory;
+
+            nodeElement.classList.add('dragging');
+            document.body.classList.add('dragging-active');
+            e.dataTransfer.effectAllowed = 'move';
+            e.dataTransfer.setData('text/plain', node.path);
+
+            // Create a custom drag image with fixed width
+            const dragImage = nodeElement.cloneNode(true);
+            dragImage.style.position = 'absolute';
+            dragImage.style.top = '-9999px';
+            dragImage.style.left = '-9999px';
+            dragImage.style.width = `${Config.DRAG_PREVIEW_WIDTH}px`;
+            dragImage.style.maxWidth = `${Config.DRAG_PREVIEW_WIDTH}px`;
+            dragImage.style.opacity = Config.DRAG_PREVIEW_OPACITY;
+            dragImage.style.backgroundColor = 'var(--bg-secondary)';
+            dragImage.style.border = '1px solid var(--border-color)';
+            dragImage.style.borderRadius = '4px';
+            dragImage.style.padding = '4px 8px';
+            dragImage.style.whiteSpace = 'nowrap';
+            dragImage.style.overflow = 'hidden';
+            dragImage.style.textOverflow = 'ellipsis';
+
+            document.body.appendChild(dragImage);
+            e.dataTransfer.setDragImage(dragImage, 10, 10);
+            setTimeout(() => {
+                if (dragImage.parentNode) {
+                    document.body.removeChild(dragImage);
+                }
+            }, 0);
+        });
+
+        // Dragend - when drag operation ends
+        nodeElement.addEventListener('dragend', () => {
+            nodeElement.classList.remove('dragging');
+            nodeElement.classList.remove('drag-ready');
+            document.body.classList.remove('dragging-active');
+            this.container.classList.remove('drag-over-root');
+            this.clearDragOverStates();
+
+            // Reset draggable state
+            nodeElement.draggable = false;
+            nodeElement.style.cursor = '';
+            this.isDraggingEnabled = false;
+
+            this.draggedNode = null;
+            this.draggedPath = null;
+            this.draggedIsDir = false;
+        });
+
+        // Dragover - when dragging over this node
+        nodeElement.addEventListener('dragover', (e) => {
+            if (!this.draggedPath) return;
+
+            const targetPath = node.path;
+            const targetIsDir = node.isDirectory;
+
+            // Only allow dropping on directories
+            if (!targetIsDir) {
+                e.dataTransfer.dropEffect = 'none';
+                return;
+            }
+
+            // Check if this is a valid drop target
+            if (this.isValidDropTarget(this.draggedPath, this.draggedIsDir, targetPath)) {
+                e.preventDefault();
+                e.dataTransfer.dropEffect = 'move';
+                nodeElement.classList.add('drag-over');
+            } else {
+                e.dataTransfer.dropEffect = 'none';
+            }
+        });
+
+        // Dragleave - when drag leaves this node
+        nodeElement.addEventListener('dragleave', (e) => {
+            // Only remove if we're actually leaving the node (not entering a child)
+            if (e.target === nodeElement) {
+                nodeElement.classList.remove('drag-over');
+
+                // If leaving a node and not entering another node, might be going to root
+                const relatedNode = e.relatedTarget?.closest('.tree-node');
+                if (!relatedNode && this.container.contains(e.relatedTarget)) {
+                    // Moving to empty space (root area)
+                    this.container.classList.add('drag-over-root');
+                }
+            }
+        });
+
+        // Drop - when item is dropped on this node
+        nodeElement.addEventListener('drop', async (e) => {
+            e.preventDefault();
+            e.stopPropagation();
+
+            nodeElement.classList.remove('drag-over');
+
+            if (!this.draggedPath) return;
+
+            const targetPath = node.path;
+            const targetIsDir = node.isDirectory;
+
+            if (targetIsDir && this.isValidDropTarget(this.draggedPath, this.draggedIsDir, targetPath)) {
+                await this.handleDrop(targetPath, targetIsDir);
+            }
+        });
+    }
+
+    clearDragOverStates() {
+        this.container.querySelectorAll('.drag-over').forEach(node => {
+            node.classList.remove('drag-over');
+        });
+    }
+
+    isValidDropTarget(sourcePath, sourceIsDir, targetPath) {
+        // Can't drop on itself
+        if (sourcePath === targetPath) {
+            return false;
+        }
+
+        // If dragging a directory, can't drop into its own descendants
+        if (sourceIsDir) {
+            // Check if target is a descendant of source
+            if (targetPath.startsWith(sourcePath + '/')) {
+                return false;
+            }
+        }
+
+        // Can't drop into the same parent directory
+        const sourceParent = PathUtils.getParentPath(sourcePath);
+        if (sourceParent === targetPath) {
+            return false;
+        }
+
+        return true;
+    }
+
+    async handleDrop(targetPath, targetIsDir) {
+        if (!this.draggedPath) return;
+
+        try {
+            const sourcePath = this.draggedPath;
+            const fileName = PathUtils.getFileName(sourcePath);
+            const isDirectory = this.draggedIsDir;
+
+            // Construct destination path
+            let destPath;
+            if (targetPath === '') {
+                // Dropping to root
+                destPath = fileName;
+            } else {
+                destPath = `${targetPath}/${fileName}`;
+            }
+
+            // Check if destination already exists
+            const destNode = this.findNode(destPath);
+            if (destNode) {
+                const overwrite = await window.ModalManager.confirm(
+                    `A ${destNode.isDirectory ? 'folder' : 'file'} named "${fileName}" already exists in the destination. Do you want to overwrite it?`,
+                    'Name Conflict',
+                    true
+                );
+
+                if (!overwrite) {
+                    return;
+                }
+
+                // Delete existing item first
+                await this.webdavClient.delete(destPath);
+
+                // Clear undo history since we're overwriting
+                this.lastMoveOperation = null;
+            }
+
+            // Perform the move
+            await this.webdavClient.move(sourcePath, destPath);
+
+            // Store undo information (only if not overwriting)
+            if (!destNode) {
+                this.lastMoveOperation = {
+                    sourcePath: sourcePath,
+                    destPath: destPath,
+                    fileName: fileName,
+                    isDirectory: isDirectory
+                };
+            }
+
+            // If the moved item was the currently selected file, update the selection
+            if (this.selectedPath === sourcePath) {
+                this.selectedPath = destPath;
+
+                // Update editor's current file path if it's the file being moved
+                if (!this.draggedIsDir && window.editor && window.editor.currentFile === sourcePath) {
+                    window.editor.currentFile = destPath;
+                    if (window.editor.filenameInput) {
+                        window.editor.filenameInput.value = destPath;
+                    }
+                }
+
+                // Notify file select callback if it's a file
+                if (!this.draggedIsDir && this.onFileSelect) {
+                    this.onFileSelect({ path: destPath, isDirectory: false });
+                }
+            }
+
+            // Reload the tree
+            await this.load();
+
+            // Re-select the moved item
+            this.selectAndExpandPath(destPath);
+
+            showNotification(`Moved ${fileName} successfully`, 'success');
+        } catch (error) {
+            console.error('Failed to move item:', error);
+            showNotification('Failed to move item: ' + error.message, 'danger');
+        }
     }
 
     async load() {
@@ -71,6 +427,19 @@ class FileTree {
 
     renderNodes(nodes, parentElement, level) {
         nodes.forEach(node => {
+            // Filter out images and image directories in view mode
+            if (this.filterImagesInViewMode) {
+                // Skip image files
+                if (!node.isDirectory && PathUtils.isBinaryFile(node.path)) {
+                    return;
+                }
+
+                // Skip image directories
+                if (node.isDirectory && PathUtils.isImageDirectory(node.path)) {
+                    return;
+                }
+            }
+
             const nodeWrapper = document.createElement('div');
             nodeWrapper.className = 'tree-node-wrapper';
 
@@ -78,30 +447,46 @@ class FileTree {
             const nodeElement = this.createNodeElement(node, level);
             nodeWrapper.appendChild(nodeElement);
 
-            // Create children container ONLY if has children
-            if (node.children && node.children.length > 0) {
+            // Create children container for directories
+            if (node.isDirectory) {
                 const childContainer = document.createElement('div');
                 childContainer.className = 'tree-children';
                 childContainer.style.display = 'none';
                 childContainer.dataset.parent = node.path;
                 childContainer.style.marginLeft = `${(level + 1) * 12}px`;
 
-                // Recursively render children
+                // Only render children if they exist
+                if (node.children && node.children.length > 0) {
                     this.renderNodes(node.children, childContainer, level + 1);
+                } else {
+                    // Empty directory - show empty state message
+                    const emptyMessage = document.createElement('div');
+                    emptyMessage.className = 'tree-empty-message';
+                    emptyMessage.textContent = 'Empty folder';
+                    childContainer.appendChild(emptyMessage);
+                }
+
                 nodeWrapper.appendChild(childContainer);
 
-                // Make toggle functional
+                // Make toggle functional for ALL directories (including empty ones)
                 const toggle = nodeElement.querySelector('.tree-node-toggle');
                 if (toggle) {
-                    toggle.addEventListener('click', (e) => {
-                        console.log('Toggle clicked', e.target);
+                    const toggleHandler = (e) => {
                         e.stopPropagation();
                         const isHidden = childContainer.style.display === 'none';
-                        console.log('Is hidden?', isHidden);
                         childContainer.style.display = isHidden ? 'block' : 'none';
-                        toggle.innerHTML = isHidden ? '▼' : '▶';
+                        toggle.style.transform = isHidden ? 'rotate(90deg)' : 'rotate(0deg)';
                         toggle.classList.toggle('expanded');
-                    });
+                    };
+
+                    // Add click listener to toggle icon
+                    toggle.addEventListener('click', toggleHandler);
+
+                    // Also allow double-click on the node to toggle
+                    nodeElement.addEventListener('dblclick', toggleHandler);
+
+                    // Make toggle cursor pointer for all directories
+                    toggle.style.cursor = 'pointer';
                 }
             }
 
@@ -128,17 +513,110 @@ class FileTree {
         }
     }
 
+    /**
+     * Find a node by path
+     * @param {string} path - The path to find
+     * @returns {Object|null} The node or null if not found
+     */
+    findNode(path) {
+        const search = (nodes, targetPath) => {
+            for (const node of nodes) {
+                if (node.path === targetPath) {
+                    return node;
+                }
+                if (node.children && node.children.length > 0) {
+                    const found = search(node.children, targetPath);
+                    if (found) return found;
+                }
+            }
+            return null;
+        };
+
+        return search(this.tree, path);
+    }
+
+    /**
+     * Get all files in a directory (direct children only)
+     * @param {string} dirPath - The directory path
+     * @returns {Array} Array of file nodes
+     */
+    getDirectoryFiles(dirPath) {
+        const dirNode = this.findNode(dirPath);
+        if (dirNode && dirNode.children) {
+            return dirNode.children.filter(child => !child.isDirectory);
+        }
+        return [];
+    }
+
     updateSelection() {
         // Remove previous selection
         this.container.querySelectorAll('.tree-node').forEach(node => {
-            node.classList.remove('selected');
+            node.classList.remove('active');
         });
 
-        // Add selection to current
+        // Add selection to current and all parent directories
         if (this.selectedPath) {
+            // Add active class to the selected file/folder
             const node = this.container.querySelector(`[data-path="${this.selectedPath}"]`);
             if (node) {
-                node.classList.add('selected');
+                node.classList.add('active');
+            }
+
+            // Add active class to all parent directories
+            const parts = this.selectedPath.split('/');
+            let currentPath = '';
+            for (let i = 0; i < parts.length - 1; i++) {
+                currentPath = currentPath ? `${currentPath}/${parts[i]}` : parts[i];
+                const parentNode = this.container.querySelector(`[data-path="${currentPath}"]`);
+                if (parentNode) {
+                    parentNode.classList.add('active');
+                }
+            }
+        }
+    }
+
+    /**
+     * Highlight a file as active and expand all parent directories
+     * @param {string} path - The file path to highlight
+     */
+    selectAndExpandPath(path) {
+        this.selectedPath = path;
+
+        // Expand all parent directories
+        this.expandParentDirectories(path);
+
+        // Update selection
+        this.updateSelection();
+    }
+
+    /**
+     * Expand all parent directories of a given path
+     * @param {string} path - The file path
+     */
+    expandParentDirectories(path) {
+        // Get all parent paths
+        const parts = path.split('/');
+        let currentPath = '';
+
+        for (let i = 0; i < parts.length - 1; i++) {
+            currentPath = currentPath ? `${currentPath}/${parts[i]}` : parts[i];
+
+            // Find the node with this path
+            const parentNode = this.container.querySelector(`[data-path="${currentPath}"]`);
+            if (parentNode && parentNode.dataset.isdir === 'true') {
+                // Find the children container
+                const wrapper = parentNode.closest('.tree-node-wrapper');
+                if (wrapper) {
+                    const childContainer = wrapper.querySelector('.tree-children');
+                    if (childContainer && childContainer.style.display === 'none') {
+                        // Expand it
+                        childContainer.style.display = 'block';
+                        const toggle = parentNode.querySelector('.tree-node-toggle');
+                        if (toggle) {
+                            toggle.classList.add('expanded');
+                        }
+                    }
+                }
             }
         }
     }
@@ -150,25 +628,111 @@ class FileTree {
         nodeElement.dataset.isdir = node.isDirectory;
         nodeElement.style.paddingLeft = `${level * 12}px`;
 
-        const icon = document.createElement('span');
-        icon.className = 'tree-node-icon';
+        // Enable drag and drop in edit mode with long-press detection
+        if (this.isEditMode()) {
+            // Start with draggable disabled
+            nodeElement.draggable = false;
+            this.setupNodeDragHandlers(nodeElement, node);
+            this.setupLongPressDetection(nodeElement, node);
+        }
+
+        // Create toggle/icon container
+        const iconContainer = document.createElement('span');
+        iconContainer.className = 'tree-node-icon';
+
         if (node.isDirectory) {
-            icon.innerHTML = '▶'; // Collapsed by default
-            icon.classList.add('tree-node-toggle');
+            // Create toggle icon for folders
+            const toggle = document.createElement('i');
+            toggle.className = 'bi bi-chevron-right tree-node-toggle';
+            toggle.style.fontSize = '12px';
+            iconContainer.appendChild(toggle);
         } else {
-            icon.innerHTML = '●'; // File icon
+            // Create file icon
+            const fileIcon = document.createElement('i');
+            fileIcon.className = 'bi bi-file-earmark-text';
+            fileIcon.style.fontSize = '14px';
+            iconContainer.appendChild(fileIcon);
         }
 
         const title = document.createElement('span');
         title.className = 'tree-node-title';
         title.textContent = node.name;
 
-        nodeElement.appendChild(icon);
+        nodeElement.appendChild(iconContainer);
         nodeElement.appendChild(title);
 
         return nodeElement;
     }
 
+    setupLongPressDetection(nodeElement, node) {
+        // Mouse down - start long-press timer
+        nodeElement.addEventListener('mousedown', (e) => {
+            // Ignore if clicking on toggle button
+            if (e.target.closest('.tree-node-toggle')) {
+                return;
+            }
+
+            this.mouseDownNode = nodeElement;
+
+            // Start timer for long-press
+            this.longPressTimer = setTimeout(() => {
+                // Long-press threshold met - enable dragging
+                this.isDraggingEnabled = true;
+                nodeElement.draggable = true;
+                nodeElement.classList.add('drag-ready');
+
+                // Change cursor to grab
+                nodeElement.style.cursor = 'grab';
+            }, this.longPressThreshold);
+        });
+
+        // Mouse up - cancel long-press timer
+        nodeElement.addEventListener('mouseup', () => {
+            this.clearLongPressTimer();
+        });
+
+        // Mouse leave - cancel long-press timer
+        nodeElement.addEventListener('mouseleave', () => {
+            this.clearLongPressTimer();
+        });
+
+        // Mouse move - cancel long-press if moved too much
+        let startX, startY;
+        nodeElement.addEventListener('mousedown', (e) => {
+            startX = e.clientX;
+            startY = e.clientY;
+        });
+
+        nodeElement.addEventListener('mousemove', (e) => {
+            if (this.longPressTimer && !this.isDraggingEnabled) {
+                const deltaX = Math.abs(e.clientX - startX);
+                const deltaY = Math.abs(e.clientY - startY);
+
+                // If mouse moved more than threshold, cancel long-press
+                if (deltaX > Config.MOUSE_MOVE_THRESHOLD || deltaY > Config.MOUSE_MOVE_THRESHOLD) {
+                    this.clearLongPressTimer();
+                }
+            }
+        });
+    }
+
+    clearLongPressTimer() {
+        if (this.longPressTimer) {
+            clearTimeout(this.longPressTimer);
+            this.longPressTimer = null;
+        }
+
+        // Reset dragging state if not currently dragging
+        if (!this.draggedPath && this.mouseDownNode) {
+            this.mouseDownNode.draggable = false;
+            this.mouseDownNode.classList.remove('drag-ready');
+            this.mouseDownNode.style.cursor = '';
+            this.isDraggingEnabled = false;
+        }
+
+        this.mouseDownNode = null;
+    }
+
     formatSize(bytes) {
         if (bytes === 0) return '0 B';
         const k = 1024;
@@ -233,8 +797,8 @@ class FileTree {
     async downloadFile(path) {
         try {
             const content = await this.webdavClient.get(path);
-            const filename = path.split('/').pop();
-            this.triggerDownload(content, filename);
+            const filename = PathUtils.getFileName(path);
+            DownloadUtils.triggerDownload(content, filename);
             showNotification('Downloaded', 'success');
         } catch (error) {
             console.error('Failed to download file:', error);
@@ -256,7 +820,7 @@ class FileTree {
             }
 
             const zip = new JSZip();
-            const folder = zip.folder(path.split('/').pop() || 'download');
+            const folder = zip.folder(PathUtils.getFileName(path) || 'download');
 
             // Add all files to zip
             for (const file of files) {
@@ -267,8 +831,8 @@ class FileTree {
 
             // Generate zip
             const zipBlob = await zip.generateAsync({ type: 'blob' });
-            const zipFilename = `${path.split('/').pop() || 'download'}.zip`;
-            this.triggerDownload(zipBlob, zipFilename);
+            const zipFilename = `${PathUtils.getFileName(path) || 'download'}.zip`;
+            DownloadUtils.triggerDownload(zipBlob, zipFilename);
             showNotification('Downloaded', 'success');
         } catch (error) {
             console.error('Failed to download folder:', error);
@@ -276,16 +840,29 @@ class FileTree {
         }
     }
 
-    triggerDownload(content, filename) {
-        const blob = content instanceof Blob ? content : new Blob([content]);
-        const url = URL.createObjectURL(blob);
-        const a = document.createElement('a');
-        a.href = url;
-        a.download = filename;
-        document.body.appendChild(a);
-        a.click();
-        document.body.removeChild(a);
-        URL.revokeObjectURL(url);
+    // triggerDownload method moved to DownloadUtils in utils.js
+
+    /**
+     * Get the first markdown file in the tree
+     * Returns the path of the first .md file found, or null if none exist
+     */
+    getFirstMarkdownFile() {
+        const findFirstFile = (nodes) => {
+            for (const node of nodes) {
+                // If it's a file and ends with .md, return it
+                if (!node.isDirectory && node.path.endsWith('.md')) {
+                    return node.path;
+                }
+                // If it's a directory with children, search recursively
+                if (node.isDirectory && node.children && node.children.length > 0) {
+                    const found = findFirstFile(node.children);
+                    if (found) return found;
+                }
+            }
+            return null;
+        };
+
+        return findFirstFile(this.tree);
     }
 }
 

static/js/file-upload.js

@@ -0,0 +1,37 @@
+/**
+ * File Upload Module
+ * Handles file upload dialog for uploading files to the file tree
+ */
+
+/**
+ * Show file upload dialog
+ * @param {string} targetPath - The target directory path
+ * @param {Function} onUpload - Callback function to handle file upload
+ */
+function showFileUploadDialog(targetPath, onUpload) {
+    const input = document.createElement('input');
+    input.type = 'file';
+    input.multiple = true;
+
+    input.addEventListener('change', async (e) => {
+        const files = Array.from(e.target.files);
+        if (files.length === 0) return;
+
+        for (const file of files) {
+            try {
+                await onUpload(targetPath, file);
+            } catch (error) {
+                Logger.error('Upload failed:', error);
+                if (window.showNotification) {
+                    window.showNotification(`Failed to upload ${file.name}`, 'error');
+                }
+            }
+        }
+    });
+
+    input.click();
+}
+
+// Make function globally available
+window.showFileUploadDialog = showFileUploadDialog;
+

static/js/loading-spinner.js

@@ -0,0 +1,151 @@
+/**
+ * Loading Spinner Component
+ * Displays a loading overlay with spinner for async operations
+ */
+
+class LoadingSpinner {
+    /**
+     * Create a loading spinner for a container
+     * @param {string|HTMLElement} container - Container element or ID
+     * @param {string} message - Optional loading message
+     */
+    constructor(container, message = 'Loading...') {
+        this.container = typeof container === 'string'
+            ? document.getElementById(container)
+            : container;
+
+        if (!this.container) {
+            Logger.error('LoadingSpinner: Container not found');
+            return;
+        }
+
+        this.message = message;
+        this.overlay = null;
+        this.isShowing = false;
+        this.showTime = null; // Track when spinner was shown
+        this.minDisplayTime = 300; // Minimum time to show spinner (ms)
+
+        // Ensure container has position relative for absolute positioning
+        const position = window.getComputedStyle(this.container).position;
+        if (position === 'static') {
+            this.container.style.position = 'relative';
+        }
+    }
+
+    /**
+     * Show the loading spinner
+     * @param {string} message - Optional custom message
+     */
+    show(message = null) {
+        if (this.isShowing) return;
+
+        // Record when spinner was shown
+        this.showTime = Date.now();
+
+        // Create overlay if it doesn't exist
+        if (!this.overlay) {
+            this.overlay = this.createOverlay(message || this.message);
+            this.container.appendChild(this.overlay);
+        } else {
+            // Update message if provided
+            if (message) {
+                const textElement = this.overlay.querySelector('.loading-text');
+                if (textElement) {
+                    textElement.textContent = message;
+                }
+            }
+            this.overlay.classList.remove('hidden');
+        }
+
+        this.isShowing = true;
+        Logger.debug(`Loading spinner shown: ${message || this.message}`);
+    }
+
+    /**
+     * Hide the loading spinner
+     * Ensures minimum display time for better UX
+     */
+    hide() {
+        if (!this.isShowing || !this.overlay) return;
+
+        // Calculate how long the spinner has been showing
+        const elapsed = Date.now() - this.showTime;
+        const remaining = Math.max(0, this.minDisplayTime - elapsed);
+
+        // If minimum time hasn't elapsed, delay hiding
+        if (remaining > 0) {
+            setTimeout(() => {
+                this.overlay.classList.add('hidden');
+                this.isShowing = false;
+                Logger.debug('Loading spinner hidden');
+            }, remaining);
+        } else {
+            this.overlay.classList.add('hidden');
+            this.isShowing = false;
+            Logger.debug('Loading spinner hidden');
+        }
+    }
+
+    /**
+     * Remove the loading spinner from DOM
+     */
+    destroy() {
+        if (this.overlay && this.overlay.parentNode) {
+            this.overlay.parentNode.removeChild(this.overlay);
+            this.overlay = null;
+        }
+        this.isShowing = false;
+    }
+
+    /**
+     * Create the overlay element
+     * @param {string} message - Loading message
+     * @returns {HTMLElement} The overlay element
+     */
+    createOverlay(message) {
+        const overlay = document.createElement('div');
+        overlay.className = 'loading-overlay';
+
+        const content = document.createElement('div');
+        content.className = 'loading-content';
+
+        const spinner = document.createElement('div');
+        spinner.className = 'loading-spinner';
+
+        const text = document.createElement('div');
+        text.className = 'loading-text';
+        text.textContent = message;
+
+        content.appendChild(spinner);
+        content.appendChild(text);
+        overlay.appendChild(content);
+
+        return overlay;
+    }
+
+    /**
+     * Update the loading message
+     * @param {string} message - New message
+     */
+    updateMessage(message) {
+        this.message = message;
+        if (this.overlay && this.isShowing) {
+            const textElement = this.overlay.querySelector('.loading-text');
+            if (textElement) {
+                textElement.textContent = message;
+            }
+        }
+    }
+
+    /**
+     * Check if spinner is currently showing
+     * @returns {boolean} True if showing
+     */
+    isVisible() {
+        return this.isShowing;
+    }
+}
+
+// Make LoadingSpinner globally available
+window.LoadingSpinner = LoadingSpinner;
+

static/js/logger.js

@@ -0,0 +1,174 @@
+/**
+ * Logger Module
+ * Provides structured logging with different levels
+ * Can be configured to show/hide different log levels
+ */
+
+class Logger {
+    /**
+     * Log levels
+     */
+    static LEVELS = {
+        DEBUG: 0,
+        INFO: 1,
+        WARN: 2,
+        ERROR: 3,
+        NONE: 4
+    };
+
+    /**
+     * Current log level
+     * Set to DEBUG by default, can be changed via setLevel()
+     */
+    static currentLevel = Logger.LEVELS.DEBUG;
+
+    /**
+     * Enable/disable logging
+     */
+    static enabled = true;
+
+    /**
+     * Set the minimum log level
+     * @param {number} level - One of Logger.LEVELS
+     */
+    static setLevel(level) {
+        if (typeof level === 'number' && level >= 0 && level <= 4) {
+            Logger.currentLevel = level;
+        }
+    }
+
+    /**
+     * Enable or disable logging
+     * @param {boolean} enabled - Whether to enable logging
+     */
+    static setEnabled(enabled) {
+        Logger.enabled = enabled;
+    }
+
+    /**
+     * Log a debug message
+     * @param {string} message - The message to log
+     * @param {...any} args - Additional arguments to log
+     */
+    static debug(message, ...args) {
+        if (!Logger.enabled || Logger.currentLevel > Logger.LEVELS.DEBUG) {
+            return;
+        }
+        console.log(`[DEBUG] ${message}`, ...args);
+    }
+
+    /**
+     * Log an info message
+     * @param {string} message - The message to log
+     * @param {...any} args - Additional arguments to log
+     */
+    static info(message, ...args) {
+        if (!Logger.enabled || Logger.currentLevel > Logger.LEVELS.INFO) {
+            return;
+        }
+        console.info(`[INFO] ${message}`, ...args);
+    }
+
+    /**
+     * Log a warning message
+     * @param {string} message - The message to log
+     * @param {...any} args - Additional arguments to log
+     */
+    static warn(message, ...args) {
+        if (!Logger.enabled || Logger.currentLevel > Logger.LEVELS.WARN) {
+            return;
+        }
+        console.warn(`[WARN] ${message}`, ...args);
+    }
+
+    /**
+     * Log an error message
+     * @param {string} message - The message to log
+     * @param {...any} args - Additional arguments to log
+     */
+    static error(message, ...args) {
+        if (!Logger.enabled || Logger.currentLevel > Logger.LEVELS.ERROR) {
+            return;
+        }
+        console.error(`[ERROR] ${message}`, ...args);
+    }
+
+    /**
+     * Log a message with a custom prefix
+     * @param {string} prefix - The prefix to use
+     * @param {string} message - The message to log
+     * @param {...any} args - Additional arguments to log
+     */
+    static log(prefix, message, ...args) {
+        if (!Logger.enabled) {
+            return;
+        }
+        console.log(`[${prefix}] ${message}`, ...args);
+    }
+
+    /**
+     * Group related log messages
+     * @param {string} label - The group label
+     */
+    static group(label) {
+        if (!Logger.enabled) {
+            return;
+        }
+        console.group(label);
+    }
+
+    /**
+     * End a log group
+     */
+    static groupEnd() {
+        if (!Logger.enabled) {
+            return;
+        }
+        console.groupEnd();
+    }
+
+    /**
+     * Log a table (useful for arrays of objects)
+     * @param {any} data - The data to display as a table
+     */
+    static table(data) {
+        if (!Logger.enabled) {
+            return;
+        }
+        console.table(data);
+    }
+
+    /**
+     * Start a timer
+     * @param {string} label - The timer label
+     */
+    static time(label) {
+        if (!Logger.enabled) {
+            return;
+        }
+        console.time(label);
+    }
+
+    /**
+     * End a timer and log the elapsed time
+     * @param {string} label - The timer label
+     */
+    static timeEnd(label) {
+        if (!Logger.enabled) {
+            return;
+        }
+        console.timeEnd(label);
+    }
+}
+
+// Make Logger globally available
+window.Logger = Logger;
+
+// Set default log level based on environment
+// In production, you might want to set this to WARN or ERROR
+if (window.location.hostname === 'localhost' || window.location.hostname === '127.0.0.1') {
+    Logger.setLevel(Logger.LEVELS.DEBUG);
+} else {
+    Logger.setLevel(Logger.LEVELS.INFO);
+}
+

static/js/macro-processor.js

@@ -25,20 +25,16 @@ class MacroProcessor {
      * Returns { success: boolean, content: string, errors: [] }
      */
     async processMacros(content) {
-        console.log('MacroProcessor: Starting macro processing for content:', content);
         const macros = MacroParser.extractMacros(content);
-        console.log('MacroProcessor: Extracted macros:', macros);
         const errors = [];
         let processedContent = content;
 
         // Process macros in reverse order to preserve positions
         for (let i = macros.length - 1; i >= 0; i--) {
             const macro = macros[i];
-            console.log('MacroProcessor: Processing macro:', macro);
 
             try {
                 const result = await this.processMacro(macro);
-                console.log('MacroProcessor: Macro processing result:', result);
 
                 if (result.success) {
                     // Replace macro with result
@@ -73,7 +69,6 @@ class MacroProcessor {
             }
         }
 
-        console.log('MacroProcessor: Final processed content:', processedContent);
         return {
             success: errors.length === 0,
             content: processedContent,

static/js/notification-service.js

@@ -0,0 +1,77 @@
+/**
+ * Notification Service
+ * Provides a standardized way to show toast notifications
+ * Wraps the showNotification function from ui-utils.js
+ */
+
+class NotificationService {
+    /**
+     * Show a success notification
+     * @param {string} message - The message to display
+     */
+    static success(message) {
+        if (window.showNotification) {
+            window.showNotification(message, Config.NOTIFICATION_TYPES.SUCCESS);
+        } else {
+            Logger.warn('showNotification not available, falling back to console');
+            console.log(`✅ ${message}`);
+        }
+    }
+
+    /**
+     * Show an error notification
+     * @param {string} message - The message to display
+     */
+    static error(message) {
+        if (window.showNotification) {
+            window.showNotification(message, Config.NOTIFICATION_TYPES.ERROR);
+        } else {
+            Logger.warn('showNotification not available, falling back to console');
+            console.error(`❌ ${message}`);
+        }
+    }
+
+    /**
+     * Show a warning notification
+     * @param {string} message - The message to display
+     */
+    static warning(message) {
+        if (window.showNotification) {
+            window.showNotification(message, Config.NOTIFICATION_TYPES.WARNING);
+        } else {
+            Logger.warn('showNotification not available, falling back to console');
+            console.warn(`⚠️ ${message}`);
+        }
+    }
+
+    /**
+     * Show an info notification
+     * @param {string} message - The message to display
+     */
+    static info(message) {
+        if (window.showNotification) {
+            window.showNotification(message, Config.NOTIFICATION_TYPES.INFO);
+        } else {
+            Logger.warn('showNotification not available, falling back to console');
+            console.info(`ℹ️ ${message}`);
+        }
+    }
+
+    /**
+     * Show a notification with a custom type
+     * @param {string} message - The message to display
+     * @param {string} type - The notification type (success, danger, warning, primary, etc.)
+     */
+    static show(message, type = 'primary') {
+        if (window.showNotification) {
+            window.showNotification(message, type);
+        } else {
+            Logger.warn('showNotification not available, falling back to console');
+            console.log(`[${type.toUpperCase()}] ${message}`);
+        }
+    }
+}
+
+// Make NotificationService globally available
+window.NotificationService = NotificationService;
+

static/js/sidebar-toggle.js

@@ -0,0 +1,114 @@
+/**
+ * Sidebar Toggle Module
+ * Manages sidebar collapse/expand functionality with localStorage persistence
+ */
+
+class SidebarToggle {
+    constructor(sidebarId, toggleButtonId) {
+        this.sidebar = document.getElementById(sidebarId);
+        this.toggleButton = document.getElementById(toggleButtonId);
+        this.storageKey = Config.STORAGE_KEYS.SIDEBAR_COLLAPSED || 'sidebarCollapsed';
+        this.isCollapsed = localStorage.getItem(this.storageKey) === 'true';
+
+        this.init();
+    }
+
+    /**
+     * Initialize the sidebar toggle
+     */
+    init() {
+        // Apply initial state
+        this.apply();
+
+        // Setup toggle button click handler
+        if (this.toggleButton) {
+            this.toggleButton.addEventListener('click', () => {
+                this.toggle();
+            });
+        }
+
+        // Make mini sidebar clickable to expand
+        if (this.sidebar) {
+            this.sidebar.addEventListener('click', (e) => {
+                // Only expand if sidebar is collapsed and click is on the mini sidebar itself
+                // (not on the file tree content when expanded)
+                if (this.isCollapsed) {
+                    this.expand();
+                }
+            });
+
+            // Add cursor pointer when collapsed
+            this.sidebar.style.cursor = 'default';
+        }
+
+        Logger.debug(`Sidebar initialized: ${this.isCollapsed ? 'collapsed' : 'expanded'}`);
+    }
+
+    /**
+     * Toggle sidebar state
+     */
+    toggle() {
+        this.isCollapsed = !this.isCollapsed;
+        localStorage.setItem(this.storageKey, this.isCollapsed);
+        this.apply();
+
+        Logger.debug(`Sidebar ${this.isCollapsed ? 'collapsed' : 'expanded'}`);
+    }
+
+    /**
+     * Apply the current sidebar state
+     */
+    apply() {
+        if (this.sidebar) {
+            if (this.isCollapsed) {
+                this.sidebar.classList.add('collapsed');
+                this.sidebar.style.cursor = 'pointer'; // Make mini sidebar clickable
+            } else {
+                this.sidebar.classList.remove('collapsed');
+                this.sidebar.style.cursor = 'default'; // Normal cursor when expanded
+            }
+        }
+
+        // Update toggle button icon
+        if (this.toggleButton) {
+            const icon = this.toggleButton.querySelector('i');
+            if (icon) {
+                if (this.isCollapsed) {
+                    icon.className = 'bi bi-layout-sidebar-inset-reverse';
+                } else {
+                    icon.className = 'bi bi-layout-sidebar';
+                }
+            }
+        }
+    }
+
+    /**
+     * Collapse the sidebar
+     */
+    collapse() {
+        if (!this.isCollapsed) {
+            this.toggle();
+        }
+    }
+
+    /**
+     * Expand the sidebar
+     */
+    expand() {
+        if (this.isCollapsed) {
+            this.toggle();
+        }
+    }
+
+    /**
+     * Check if sidebar is currently collapsed
+     * @returns {boolean} True if sidebar is collapsed
+     */
+    isCollapsedState() {
+        return this.isCollapsed;
+    }
+}
+
+// Make SidebarToggle globally available
+window.SidebarToggle = SidebarToggle;
+

static/js/ui-utils.js

@@ -1,10 +1,19 @@
 /**
  * UI Utilities Module
- * Toast notifications, context menu, dark mode, file upload dialog
+ * Toast notifications (kept for backward compatibility)
+ *
+ * Other utilities have been moved to separate modules:
+ * - Context menu: context-menu.js
+ * - File upload: file-upload.js
+ * - Dark mode: dark-mode.js
+ * - Collection selector: collection-selector.js
+ * - Editor drop handler: editor-drop-handler.js
  */
 
 /**
  * Show toast notification
+ * @param {string} message - The message to display
+ * @param {string} type - The notification type (info, success, error, warning, danger, primary)
  */
 function showNotification(message, type = 'info') {
     const container = document.getElementById('toastContainer') || createToastContainer();
@@ -23,7 +32,7 @@ function showNotification(message, type = 'info') {
 
     container.appendChild(toast);
 
-    const bsToast = new bootstrap.Toast(toast, { delay: 3000 });
+    const bsToast = new bootstrap.Toast(toast, { delay: Config.TOAST_DURATION });
     bsToast.show();
 
     toast.addEventListener('hidden.bs.toast', () => {
@@ -31,240 +40,21 @@ function showNotification(message, type = 'info') {
     });
 }
 
+/**
+ * Create the toast container if it doesn't exist
+ * @returns {HTMLElement} The toast container element
+ */
 function createToastContainer() {
     const container = document.createElement('div');
     container.id = 'toastContainer';
     container.className = 'toast-container position-fixed top-0 end-0 p-3';
-    container.style.zIndex = '9999';
+    container.style.zIndex = Config.TOAST_Z_INDEX;
     document.body.appendChild(container);
     return container;
 }
 
-/**
- * Enhanced Context Menu
- */
-function showContextMenu(x, y, target) {
-    const menu = document.getElementById('contextMenu');
-    if (!menu) return;
-    
-    // Store target data
-    menu.dataset.targetPath = target.path;
-    menu.dataset.targetIsDir = target.isDir;
-    
-    // Show/hide menu items based on target type
-    const items = {
-        'new-file': target.isDir,
-        'new-folder': target.isDir,
-        'upload': target.isDir,
-        'download': true,
-        'paste': target.isDir && window.fileTreeActions?.clipboard,
-        'open': !target.isDir
-    };
-    
-    Object.entries(items).forEach(([action, show]) => {
-        const item = menu.querySelector(`[data-action="${action}"]`);
-        if (item) {
-            item.style.display = show ? 'flex' : 'none';
-        }
-    });
-    
-    // Position menu
-    menu.style.display = 'block';
-    menu.style.left = x + 'px';
-    menu.style.top = y + 'px';
-    
-    // Adjust if off-screen
-    setTimeout(() => {
-        const rect = menu.getBoundingClientRect();
-        if (rect.right > window.innerWidth) {
-            menu.style.left = (window.innerWidth - rect.width - 10) + 'px';
-        }
-        if (rect.bottom > window.innerHeight) {
-            menu.style.top = (window.innerHeight - rect.height - 10) + 'px';
-        }
-    }, 0);
-}
-
-function hideContextMenu() {
-    const menu = document.getElementById('contextMenu');
-    if (menu) {
-        menu.style.display = 'none';
-    }
-}
-
-// Combined click handler for context menu and outside clicks
-document.addEventListener('click', async (e) => {
-    const menuItem = e.target.closest('.context-menu-item');
-    
-    if (menuItem) {
-        // Handle context menu item click
-        const action = menuItem.dataset.action;
-        const menu = document.getElementById('contextMenu');
-        const targetPath = menu.dataset.targetPath;
-        const isDir = menu.dataset.targetIsDir === 'true';
-
-        hideContextMenu();
-
-        if (window.fileTreeActions) {
-            await window.fileTreeActions.execute(action, targetPath, isDir);
-        }
-    } else if (!e.target.closest('#contextMenu') && !e.target.closest('.tree-node')) {
-        // Hide on outside click
-        hideContextMenu();
-    }
-});
-
-/**
- * File Upload Dialog
- */
-function showFileUploadDialog(targetPath, onUpload) {
-    const input = document.createElement('input');
-    input.type = 'file';
-    input.multiple = true;
-    
-    input.addEventListener('change', async (e) => {
-        const files = Array.from(e.target.files);
-        if (files.length === 0) return;
-        
-        for (const file of files) {
-            try {
-                await onUpload(targetPath, file);
-            } catch (error) {
-                console.error('Upload failed:', error);
-            }
-        }
-    });
-    
-    input.click();
-}
-
-/**
- * Dark Mode Manager
- */
-class DarkMode {
-    constructor() {
-        this.isDark = localStorage.getItem('darkMode') === 'true';
-        this.apply();
-    }
-    
-    toggle() {
-        this.isDark = !this.isDark;
-        localStorage.setItem('darkMode', this.isDark);
-        this.apply();
-    }
-    
-    apply() {
-        if (this.isDark) {
-            document.body.classList.add('dark-mode');
-            const btn = document.getElementById('darkModeBtn');
-            if (btn) btn.textContent = '☀️';
-            
-            // Update mermaid theme
-            if (window.mermaid) {
-                mermaid.initialize({ theme: 'dark' });
-            }
-        } else {
-            document.body.classList.remove('dark-mode');
-            const btn = document.getElementById('darkModeBtn');
-            if (btn) btn.textContent = '🌙';
-            
-            // Update mermaid theme
-            if (window.mermaid) {
-                mermaid.initialize({ theme: 'default' });
-            }
-        }
-    }
-}
-
-/**
- * Collection Selector
- */
-class CollectionSelector {
-    constructor(selectId, webdavClient) {
-        this.select = document.getElementById(selectId);
-        this.webdavClient = webdavClient;
-        this.onChange = null;
-    }
-    
-    async load() {
-        try {
-            const collections = await this.webdavClient.getCollections();
-            this.select.innerHTML = '';
-            
-            collections.forEach(collection => {
-                const option = document.createElement('option');
-                option.value = collection;
-                option.textContent = collection;
-                this.select.appendChild(option);
-            });
-            
-            // Select first collection
-            if (collections.length > 0) {
-                this.select.value = collections[0];
-                this.webdavClient.setCollection(collections[0]);
-                if (this.onChange) {
-                    this.onChange(collections[0]);
-                }
-            }
-            
-            // Add change listener
-            this.select.addEventListener('change', () => {
-                const collection = this.select.value;
-                this.webdavClient.setCollection(collection);
-                if (this.onChange) {
-                    this.onChange(collection);
-                }
-            });
-        } catch (error) {
-            console.error('Failed to load collections:', error);
-            showNotification('Failed to load collections', 'error');
-        }
-    }
-}
-
-/**
- * Editor Drop Handler
- * Handles file drops into the editor
- */
-class EditorDropHandler {
-    constructor(editorElement, onFileDrop) {
-        this.editorElement = editorElement;
-        this.onFileDrop = onFileDrop;
-        this.setupHandlers();
-    }
-    
-    setupHandlers() {
-        this.editorElement.addEventListener('dragover', (e) => {
-            e.preventDefault();
-            e.stopPropagation();
-            this.editorElement.classList.add('drag-over');
-        });
-        
-        this.editorElement.addEventListener('dragleave', (e) => {
-            e.preventDefault();
-            e.stopPropagation();
-            this.editorElement.classList.remove('drag-over');
-        });
-        
-        this.editorElement.addEventListener('drop', async (e) => {
-            e.preventDefault();
-            e.stopPropagation();
-            this.editorElement.classList.remove('drag-over');
-            
-            const files = Array.from(e.dataTransfer.files);
-            if (files.length === 0) return;
-            
-            for (const file of files) {
-                try {
-                    if (this.onFileDrop) {
-                        await this.onFileDrop(file);
-                    }
-                } catch (error) {
-                    console.error('Drop failed:', error);
-                    showNotification(`Failed to upload ${file.name}`, 'error');
-                }
-            }
-        });
-    }
-}
+// All other UI utilities have been moved to separate modules
+// See the module list at the top of this file
 
+// Make showNotification globally available
+window.showNotification = showNotification;

static/js/utils.js

@@ -0,0 +1,429 @@
+/**
+ * Utilities Module
+ * Common utility functions used throughout the application
+ */
+
+/**
+ * Path Utilities
+ * Helper functions for path manipulation
+ */
+const PathUtils = {
+    /**
+     * Get the filename from a path
+     * @param {string} path - The file path
+     * @returns {string} The filename
+     * @example PathUtils.getFileName('folder/subfolder/file.md') // 'file.md'
+     */
+    getFileName(path) {
+        if (!path) return '';
+        return path.split('/').pop();
+    },
+
+    /**
+     * Get the parent directory path
+     * @param {string} path - The file path
+     * @returns {string} The parent directory path
+     * @example PathUtils.getParentPath('folder/subfolder/file.md') // 'folder/subfolder'
+     */
+    getParentPath(path) {
+        if (!path) return '';
+        const lastSlash = path.lastIndexOf('/');
+        return lastSlash === -1 ? '' : path.substring(0, lastSlash);
+    },
+
+    /**
+     * Normalize a path by removing duplicate slashes
+     * @param {string} path - The path to normalize
+     * @returns {string} The normalized path
+     * @example PathUtils.normalizePath('folder//subfolder///file.md') // 'folder/subfolder/file.md'
+     */
+    normalizePath(path) {
+        if (!path) return '';
+        return path.replace(/\/+/g, '/');
+    },
+
+    /**
+     * Join multiple path segments
+     * @param {...string} paths - Path segments to join
+     * @returns {string} The joined path
+     * @example PathUtils.joinPaths('folder', 'subfolder', 'file.md') // 'folder/subfolder/file.md'
+     */
+    joinPaths(...paths) {
+        return PathUtils.normalizePath(paths.filter(p => p).join('/'));
+    },
+
+    /**
+     * Get the file extension
+     * @param {string} path - The file path
+     * @returns {string} The file extension (without dot)
+     * @example PathUtils.getExtension('file.md') // 'md'
+     */
+    getExtension(path) {
+        if (!path) return '';
+        const fileName = PathUtils.getFileName(path);
+        const lastDot = fileName.lastIndexOf('.');
+        return lastDot === -1 ? '' : fileName.substring(lastDot + 1);
+    },
+
+    /**
+     * Check if a path is a descendant of another path
+     * @param {string} path - The path to check
+     * @param {string} ancestorPath - The potential ancestor path
+     * @returns {boolean} True if path is a descendant of ancestorPath
+     * @example PathUtils.isDescendant('folder/subfolder/file.md', 'folder') // true
+     */
+    isDescendant(path, ancestorPath) {
+        if (!path || !ancestorPath) return false;
+        return path.startsWith(ancestorPath + '/');
+    },
+
+    /**
+     * Check if a file is a binary/non-editable file based on extension
+     * @param {string} path - The file path
+     * @returns {boolean} True if the file is binary/non-editable
+     * @example PathUtils.isBinaryFile('image.png') // true
+     * @example PathUtils.isBinaryFile('document.md') // false
+     */
+    isBinaryFile(path) {
+        const extension = PathUtils.getExtension(path).toLowerCase();
+        const binaryExtensions = [
+            // Images
+            'png', 'jpg', 'jpeg', 'gif', 'bmp', 'ico', 'svg', 'webp', 'tiff', 'tif',
+            // Documents
+            'pdf', 'doc', 'docx', 'xls', 'xlsx', 'ppt', 'pptx',
+            // Archives
+            'zip', 'rar', '7z', 'tar', 'gz', 'bz2',
+            // Executables
+            'exe', 'dll', 'so', 'dylib', 'app',
+            // Media
+            'mp3', 'mp4', 'avi', 'mov', 'wmv', 'flv', 'wav', 'ogg',
+            // Other binary formats
+            'bin', 'dat', 'db', 'sqlite'
+        ];
+        return binaryExtensions.includes(extension);
+    },
+
+    /**
+     * Check if a directory is an image directory based on its name
+     * @param {string} path - The directory path
+     * @returns {boolean} True if the directory is for images
+     * @example PathUtils.isImageDirectory('images') // true
+     * @example PathUtils.isImageDirectory('assets/images') // true
+     * @example PathUtils.isImageDirectory('docs') // false
+     */
+    isImageDirectory(path) {
+        const dirName = PathUtils.getFileName(path).toLowerCase();
+        const imageDirectoryNames = [
+            'images',
+            'image',
+            'img',
+            'imgs',
+            'pictures',
+            'pics',
+            'photos',
+            'assets',
+            'media',
+            'static'
+        ];
+        return imageDirectoryNames.includes(dirName);
+    },
+
+    /**
+     * Get a human-readable file type description
+     * @param {string} path - The file path
+     * @returns {string} The file type description
+     * @example PathUtils.getFileType('image.png') // 'Image'
+     */
+    getFileType(path) {
+        const extension = PathUtils.getExtension(path).toLowerCase();
+
+        const imageExtensions = ['png', 'jpg', 'jpeg', 'gif', 'bmp', 'ico', 'svg', 'webp', 'tiff', 'tif'];
+        const documentExtensions = ['pdf', 'doc', 'docx', 'xls', 'xlsx', 'ppt', 'pptx'];
+        const archiveExtensions = ['zip', 'rar', '7z', 'tar', 'gz', 'bz2'];
+        const mediaExtensions = ['mp3', 'mp4', 'avi', 'mov', 'wmv', 'flv', 'wav', 'ogg'];
+
+        if (imageExtensions.includes(extension)) return 'Image';
+        if (documentExtensions.includes(extension)) return 'Document';
+        if (archiveExtensions.includes(extension)) return 'Archive';
+        if (mediaExtensions.includes(extension)) return 'Media';
+        if (extension === 'pdf') return 'PDF';
+
+        return 'File';
+    }
+};
+
+/**
+ * DOM Utilities
+ * Helper functions for DOM manipulation
+ */
+const DOMUtils = {
+    /**
+     * Create an element with optional class and attributes
+     * @param {string} tag - The HTML tag name
+     * @param {string} [className] - Optional class name(s)
+     * @param {Object} [attributes] - Optional attributes object
+     * @returns {HTMLElement} The created element
+     */
+    createElement(tag, className = '', attributes = {}) {
+        const element = document.createElement(tag);
+        if (className) {
+            element.className = className;
+        }
+        Object.entries(attributes).forEach(([key, value]) => {
+            element.setAttribute(key, value);
+        });
+        return element;
+    },
+
+    /**
+     * Remove all children from an element
+     * @param {HTMLElement} element - The element to clear
+     */
+    removeAllChildren(element) {
+        while (element.firstChild) {
+            element.removeChild(element.firstChild);
+        }
+    },
+
+    /**
+     * Toggle a class on an element
+     * @param {HTMLElement} element - The element
+     * @param {string} className - The class name
+     * @param {boolean} [force] - Optional force add/remove
+     */
+    toggleClass(element, className, force) {
+        if (force !== undefined) {
+            element.classList.toggle(className, force);
+        } else {
+            element.classList.toggle(className);
+        }
+    },
+
+    /**
+     * Query selector with error handling
+     * @param {string} selector - The CSS selector
+     * @param {HTMLElement} [parent] - Optional parent element
+     * @returns {HTMLElement|null} The found element or null
+     */
+    querySelector(selector, parent = document) {
+        try {
+            return parent.querySelector(selector);
+        } catch (error) {
+            Logger.error(`Invalid selector: ${selector}`, error);
+            return null;
+        }
+    },
+
+    /**
+     * Query selector all with error handling
+     * @param {string} selector - The CSS selector
+     * @param {HTMLElement} [parent] - Optional parent element
+     * @returns {NodeList|Array} The found elements or empty array
+     */
+    querySelectorAll(selector, parent = document) {
+        try {
+            return parent.querySelectorAll(selector);
+        } catch (error) {
+            Logger.error(`Invalid selector: ${selector}`, error);
+            return [];
+        }
+    }
+};
+
+/**
+ * Timing Utilities
+ * Helper functions for timing and throttling
+ */
+const TimingUtils = {
+    /**
+     * Debounce a function
+     * @param {Function} func - The function to debounce
+     * @param {number} wait - The wait time in milliseconds
+     * @returns {Function} The debounced function
+     */
+    debounce(func, wait) {
+        let timeout;
+        return function executedFunction(...args) {
+            const later = () => {
+                clearTimeout(timeout);
+                func(...args);
+            };
+            clearTimeout(timeout);
+            timeout = setTimeout(later, wait);
+        };
+    },
+
+    /**
+     * Throttle a function
+     * @param {Function} func - The function to throttle
+     * @param {number} wait - The wait time in milliseconds
+     * @returns {Function} The throttled function
+     */
+    throttle(func, wait) {
+        let inThrottle;
+        return function executedFunction(...args) {
+            if (!inThrottle) {
+                func(...args);
+                inThrottle = true;
+                setTimeout(() => inThrottle = false, wait);
+            }
+        };
+    },
+
+    /**
+     * Delay execution
+     * @param {number} ms - Milliseconds to delay
+     * @returns {Promise} Promise that resolves after delay
+     */
+    delay(ms) {
+        return new Promise(resolve => setTimeout(resolve, ms));
+    }
+};
+
+/**
+ * Download Utilities
+ * Helper functions for file downloads
+ */
+const DownloadUtils = {
+    /**
+     * Trigger a download in the browser
+     * @param {string|Blob} content - The content to download
+     * @param {string} filename - The filename for the download
+     */
+    triggerDownload(content, filename) {
+        const blob = content instanceof Blob ? content : new Blob([content]);
+        const url = URL.createObjectURL(blob);
+        const a = document.createElement('a');
+        a.href = url;
+        a.download = filename;
+        document.body.appendChild(a);
+        a.click();
+        document.body.removeChild(a);
+        URL.revokeObjectURL(url);
+    },
+
+    /**
+     * Download content as a blob
+     * @param {Blob} blob - The blob to download
+     * @param {string} filename - The filename for the download
+     */
+    downloadAsBlob(blob, filename) {
+        DownloadUtils.triggerDownload(blob, filename);
+    }
+};
+
+/**
+ * Validation Utilities
+ * Helper functions for input validation
+ */
+const ValidationUtils = {
+    /**
+     * Validate and sanitize a filename
+     * @param {string} name - The filename to validate
+     * @param {boolean} [isFolder=false] - Whether this is a folder name
+     * @returns {Object} Validation result with {valid, sanitized, message}
+     */
+    validateFileName(name, isFolder = false) {
+        const type = isFolder ? 'folder' : 'file';
+
+        if (!name || name.trim().length === 0) {
+            return { valid: false, sanitized: '', message: `${type} name cannot be empty` };
+        }
+
+        // Check for invalid characters using pattern from Config
+        const validPattern = Config.FILENAME_PATTERN;
+
+        if (!validPattern.test(name)) {
+            const sanitized = ValidationUtils.sanitizeFileName(name);
+
+            return {
+                valid: false,
+                sanitized,
+                message: `Invalid characters in ${type} name. Only lowercase letters, numbers, and underscores allowed.\n\nSuggestion: "${sanitized}"`
+            };
+        }
+
+        return { valid: true, sanitized: name, message: '' };
+    },
+
+    /**
+     * Sanitize a filename by removing/replacing invalid characters
+     * @param {string} name - The filename to sanitize
+     * @returns {string} The sanitized filename
+     */
+    sanitizeFileName(name) {
+        return name
+            .toLowerCase()
+            .replace(Config.FILENAME_INVALID_CHARS, '_')
+            .replace(/_+/g, '_')
+            .replace(/^_+|_+$/g, '');
+    },
+
+    /**
+     * Check if a string is empty or whitespace
+     * @param {string} str - The string to check
+     * @returns {boolean} True if empty or whitespace
+     */
+    isEmpty(str) {
+        return !str || str.trim().length === 0;
+    },
+
+    /**
+     * Check if a value is a valid email
+     * @param {string} email - The email to validate
+     * @returns {boolean} True if valid email
+     */
+    isValidEmail(email) {
+        const emailPattern = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
+        return emailPattern.test(email);
+    }
+};
+
+/**
+ * String Utilities
+ * Helper functions for string manipulation
+ */
+const StringUtils = {
+    /**
+     * Truncate a string to a maximum length
+     * @param {string} str - The string to truncate
+     * @param {number} maxLength - Maximum length
+     * @param {string} [suffix='...'] - Suffix to add if truncated
+     * @returns {string} The truncated string
+     */
+    truncate(str, maxLength, suffix = '...') {
+        if (!str || str.length <= maxLength) return str;
+        return str.substring(0, maxLength - suffix.length) + suffix;
+    },
+
+    /**
+     * Capitalize the first letter of a string
+     * @param {string} str - The string to capitalize
+     * @returns {string} The capitalized string
+     */
+    capitalize(str) {
+        if (!str) return '';
+        return str.charAt(0).toUpperCase() + str.slice(1);
+    },
+
+    /**
+     * Convert a string to kebab-case
+     * @param {string} str - The string to convert
+     * @returns {string} The kebab-case string
+     */
+    toKebabCase(str) {
+        return str
+            .replace(/([a-z])([A-Z])/g, '$1-$2')
+            .replace(/[\s_]+/g, '-')
+            .toLowerCase();
+    }
+};
+
+// Make utilities globally available
+window.PathUtils = PathUtils;
+window.DOMUtils = DOMUtils;
+window.TimingUtils = TimingUtils;
+window.DownloadUtils = DownloadUtils;
+window.ValidationUtils = ValidationUtils;
+window.StringUtils = StringUtils;
+

static/js/webdav-client.js

@@ -29,6 +29,24 @@ class WebDAVClient {
         return await response.json();
     }
 
+    async createCollection(collectionName) {
+        // Use POST API to create collection (not MKCOL, as collections are managed by the server)
+        const response = await fetch(this.baseUrl, {
+            method: 'POST',
+            headers: {
+                'Content-Type': 'application/json'
+            },
+            body: JSON.stringify({ name: collectionName })
+        });
+
+        if (!response.ok) {
+            const errorData = await response.json().catch(() => ({ error: response.statusText }));
+            throw new Error(errorData.error || `Failed to create collection: ${response.status} ${response.statusText}`);
+        }
+
+        return true;
+    }
+
     async propfind(path = '', depth = '1') {
         const url = this.getFullUrl(path);
         const response = await fetch(url, {
@@ -47,6 +65,33 @@ class WebDAVClient {
         return this.parseMultiStatus(xml);
     }
 
+    /**
+     * List files and directories in a path
+     * Returns only direct children (depth=1) to avoid infinite recursion
+     * @param {string} path - Path to list
+     * @param {boolean} recursive - If true, returns all nested items (depth=infinity)
+     * @returns {Promise<Array>} Array of items
+     */
+    async list(path = '', recursive = false) {
+        const depth = recursive ? 'infinity' : '1';
+        const items = await this.propfind(path, depth);
+
+        // If not recursive, filter to only direct children
+        if (!recursive && path) {
+            // Normalize path (remove trailing slash)
+            const normalizedPath = path.endsWith('/') ? path.slice(0, -1) : path;
+            const pathDepth = normalizedPath.split('/').length;
+
+            // Filter items to only include direct children
+            return items.filter(item => {
+                const itemDepth = item.path.split('/').length;
+                return itemDepth === pathDepth + 1;
+            });
+        }
+
+        return items;
+    }
+
     async get(path) {
         const url = this.getFullUrl(path);
         const response = await fetch(url);
@@ -162,6 +207,41 @@ class WebDAVClient {
         return true;
     }
 
+    // Alias for mkcol
+    async createFolder(path) {
+        return await this.mkcol(path);
+    }
+
+    /**
+     * Ensure all parent directories exist for a given path
+     * Creates missing parent directories recursively
+     */
+    async ensureParentDirectories(filePath) {
+        const parts = filePath.split('/');
+
+        // Remove the filename (last part)
+        parts.pop();
+
+        // If no parent directories, nothing to do
+        if (parts.length === 0) {
+            return;
+        }
+
+        // Create each parent directory level
+        let currentPath = '';
+        for (const part of parts) {
+            currentPath = currentPath ? `${currentPath}/${part}` : part;
+
+            try {
+                await this.mkcol(currentPath);
+            } catch (error) {
+                // Ignore errors - directory might already exist
+                // Only log for debugging
+                console.debug(`Directory ${currentPath} might already exist:`, error.message);
+            }
+        }
+    }
+
     async includeFile(path) {
         try {
             // Parse path: "collection:path/to/file" or "path/to/file"

static/style.css

@@ -33,7 +33,8 @@ body.dark-mode {
 }
 
 /* Global styles */
-html, body {
+html,
+body {
     height: 100%;
     margin: 0;
     padding: 0;
@@ -48,12 +49,6 @@ body {
     transition: background-color 0.3s ease, color 0.3s ease;
 }
 
-.container-fluid {
-    flex: 1;
-    padding: 0;
-    overflow: hidden;
-}
-
 .row {
     margin: 0;
 }
@@ -206,7 +201,12 @@ body.dark-mode .CodeMirror-linenumber {
 }
 
 /* Markdown preview styles */
-#preview h1, #preview h2, #preview h3, #preview h4, #preview h5, #preview h6 {
+#preview h1,
+#preview h2,
+#preview h3,
+#preview h4,
+#preview h5,
+#preview h6 {
     margin-top: 24px;
     margin-bottom: 16px;
     font-weight: 600;
@@ -286,7 +286,8 @@ body.dark-mode .CodeMirror-linenumber {
     margin-bottom: 16px;
 }
 
-#preview ul, #preview ol {
+#preview ul,
+#preview ol {
     margin-bottom: 16px;
     padding-left: 2em;
 }
@@ -591,4 +592,3 @@ body.dark-mode .sidebar h6 {
 body.dark-mode .tree-children {
     border-left-color: var(--border-color);
 }
-

templates/index.html

@@ -30,20 +30,47 @@
     <!-- Navbar -->
     <nav class="navbar navbar-expand-lg">
         <div class="container-fluid">
-            <span class="navbar-brand">
+            <!-- Left: Sidebar Toggle + Logo and Title -->
+            <div class="d-flex align-items-center gap-2">
+                <!-- Sidebar Toggle Button -->
+                <button id="sidebarToggleBtn" class="btn-flat btn-flat-secondary" title="Toggle Sidebar">
+                    <i class="bi bi-layout-sidebar"></i>
+                </button>
+
+                <!-- Logo and Title (Clickable) -->
+                <a href="/" class="navbar-brand mb-0" id="navbarBrand" style="cursor: pointer; text-decoration: none;">
                     <i class="bi bi-markdown"></i> Markdown Editor
-            </span>
-            <div class="d-flex gap-2">
-                <button id="newBtn" class="btn btn-success btn-sm">
+                </a>
+            </div>
+
+            <!-- Right: All Buttons -->
+            <div class="ms-auto d-flex gap-2 align-items-center">
+                <!-- View Mode Button -->
+                <button id="editModeBtn" class="btn-flat btn-flat" style="display: none;">
+                    <i class="bi bi-pencil-square"></i> Edit this file
+                </button>
+
+                <!-- Edit Mode Buttons -->
+                <button id="newBtn" class="btn-flat btn-flat-success">
                     <i class="bi bi-file-plus"></i> New
                 </button>
-                <button id="saveBtn" class="btn btn-primary btn-sm">
+                <button id="saveBtn" class="btn-flat btn-flat-primary">
                     <i class="bi bi-save"></i> Save
                 </button>
-                <button id="deleteBtn" class="btn btn-danger btn-sm">
+                <button id="deleteBtn" class="btn-flat btn-flat-danger">
                     <i class="bi bi-trash"></i> Delete
                 </button>
-                <button id="darkModeBtn" class="btn btn-secondary btn-sm">🌙</button>
+                <button id="exitEditModeBtn" class="btn-flat btn-flat-secondary">
+                    <i class="bi bi-eye"></i> Exit Edit Mode
+                </button>
+
+                <!-- Divider -->
+                <div class="vr" style="height: 40px;"></div>
+
+                <!-- Dark Mode Toggle -->
+                <button id="darkModeBtn" class="btn-flat btn-flat-secondary">
+                    <i class="bi bi-moon-fill"></i>
+                </button>
             </div>
         </div>
     </nav>
@@ -56,7 +83,13 @@
                 <!-- Collection Selector -->
                 <div class="collection-selector">
                     <label class="form-label small">Collection:</label>
-                    <select id="collectionSelect" class="form-select form-select-sm"></select>
+                    <div class="d-flex gap-1">
+                        <select id="collectionSelect" class="form-select form-select-sm flex-grow-1"></select>
+                        <button id="newCollectionBtn" class="btn btn-sm new-collection-btn"
+                            title="Create New Collection">
+                            <i class="bi bi-plus-lg"></i>
+                        </button>
+                    </div>
                 </div>
                 <!-- File Tree -->
                 <div id="fileTree" class="file-tree"></div>
@@ -120,13 +153,21 @@
             <i class="bi bi-clipboard"></i> Paste
         </div>
         <div class="context-menu-divider"></div>
+        <div class="context-menu-item" data-action="copy-to-collection">
+            <i class="bi bi-box-arrow-right"></i> Copy to Collection...
+        </div>
+        <div class="context-menu-item" data-action="move-to-collection">
+            <i class="bi bi-arrow-right-square"></i> Move to Collection...
+        </div>
+        <div class="context-menu-divider"></div>
         <div class="context-menu-item text-danger" data-action="delete">
             <i class="bi bi-trash"></i> Delete
         </div>
     </div>
 
     <!-- Confirmation Modal -->
-    <div class="modal fade" id="confirmationModal" tabindex="-1" aria-labelledby="confirmationModalLabel" aria-hidden="true">
+    <div class="modal fade" id="confirmationModal" tabindex="-1" aria-labelledby="confirmationModalLabel"
+        aria-hidden="true">
         <div class="modal-dialog">
             <div class="modal-content">
                 <div class="modal-header">
@@ -138,8 +179,12 @@
                     <input type="text" id="confirmationInput" class="form-control" style="display: none;">
                 </div>
                 <div class="modal-footer">
-                    <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Cancel</button>
-                    <button type="button" class="btn btn-primary" id="confirmButton">OK</button>
+                    <button type="button" class="btn-flat btn-flat-secondary" data-bs-dismiss="modal">
+                        <i class="bi bi-x-circle"></i> Cancel
+                    </button>
+                    <button type="button" class="btn-flat btn-flat-primary" id="confirmButton">
+                        <i class="bi bi-check-circle"></i> OK
+                    </button>
                 </div>
             </div>
         </div>
@@ -178,10 +223,27 @@
     <!-- Mermaid for diagrams -->
     <script src="https://cdn.jsdelivr.net/npm/mermaid@10/dist/mermaid.min.js"></script>
 
+    <!-- Application Configuration (must load first) -->
+    <script src="/static/js/config.js"></script>
+    <script src="/static/js/logger.js"></script>
+    <script src="/static/js/event-bus.js"></script>
+    <script src="/static/js/utils.js"></script>
+    <script src="/static/js/notification-service.js"></script>
+
+    <!-- UI Components -->
+    <script src="/static/js/ui-utils.js" defer></script>
+    <script src="/static/js/context-menu.js" defer></script>
+    <script src="/static/js/file-upload.js" defer></script>
+    <script src="/static/js/dark-mode.js" defer></script>
+    <script src="/static/js/sidebar-toggle.js" defer></script>
+    <script src="/static/js/collection-selector.js" defer></script>
+    <script src="/static/js/editor-drop-handler.js" defer></script>
+    <script src="/static/js/loading-spinner.js" defer></script>
+
+    <!-- Core Application Modules -->
     <script src="/static/js/webdav-client.js" defer></script>
     <script src="/static/js/file-tree.js" defer></script>
     <script src="/static/js/editor.js" defer></script>
-    <script src="/static/js/ui-utils.js" defer></script>
     <script src="/static/js/confirmation.js" defer></script>
     <script src="/static/js/file-tree-actions.js" defer></script>
     <script src="/static/js/column-resizer.js" defer></script>