feat: Implement offline library management with IndexedDB support

- Added `useOfflineLibrary` hook for managing offline library state and synchronization.
- Created `OfflineLibraryManager` class for handling IndexedDB operations and syncing with Navidrome API.
- Implemented methods for retrieving and storing albums, artists, songs, and playlists.
- Added support for offline favorites management (star/unstar).
- Implemented playlist creation, updating, and deletion functionalities.
- Added search functionality for offline data.
- Created a manifest file for PWA support with icons and shortcuts.
- Added service worker file for caching and offline capabilities.

lib/gravatar.ts

@@ -14,7 +14,7 @@ export function getGravatarUrl(
 ): string {
   // Normalize email: trim whitespace and convert to lowercase
   const normalizedEmail = email.trim().toLowerCase();
-  
+  // i love md5 hash (no i dont)
   // Generate MD5 hash of the email
   const hash = crypto.createHash('md5').update(normalizedEmail).digest('hex');