refactor: migrate extension to TypeScript and add Material-UI components

hero_vault_extension/public/manifest.json

@@ -0,0 +1,26 @@
+{
+  "manifest_version": 3,
+  "name": "Hero Vault",
+  "version": "1.0.0",
+  "description": "A secure browser extension for cryptographic operations and Rhai script execution",
+  "action": {
+    "default_popup": "index.html",
+    "default_title": "Hero Vault"
+  },
+  "icons": {
+    "16": "icons/icon-16.png",
+    "48": "icons/icon-48.png",
+    "128": "icons/icon-128.png"
+  },
+  "permissions": [
+    "storage",
+    "unlimitedStorage"
+  ],
+  "background": {
+    "service_worker": "src/background/simple-background.ts",
+    "type": "module"
+  },
+  "content_security_policy": {
+    "extension_pages": "script-src 'self' 'wasm-unsafe-eval'; object-src 'self'"
+  }
+}