feat: migrate audio player and remove unused pages

- Moved audio player from page component to root layout for persistent playback across all pages
- Removed unused auth pages (login, register) and content pages (contact, dahabiyas, experiences, etc.)
- Updated NavLink text color to gold-900 for better visibility
- Added 'use client' directive to AudioPlayerBar component for client-side rendering

src/components/ui/AudioPlayerBar.jsx

@@ -1,3 +1,5 @@
+'use client';
+
 import AudioPlayerBar from '@kevtucker/react-audio-player-bar';
 
 function BottomAudioPlayer() {