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.

app/settings/page.tsx

@@ -14,6 +14,7 @@ import { useSidebarShortcuts, SidebarShortcutType } from '@/hooks/use-sidebar-sh
 import { SidebarCustomization } from '@/app/components/SidebarCustomization';
 import { SettingsManagement } from '@/app/components/SettingsManagement';
 import { CacheManagement } from '@/app/components/CacheManagement';
+import { OfflineManagement } from '@/app/components/OfflineManagement';
 import { FaServer, FaUser, FaLock, FaCheck, FaTimes, FaLastfm, FaCog } from 'react-icons/fa';
 import { Settings, ExternalLink } from 'lucide-react';
 
@@ -712,6 +713,11 @@ const SettingsPage = () => {
                   <CacheManagement />
                 </div>
 
+                {/* Offline Library Management */}
+                <div className="break-inside-avoid mb-6">
+                  <OfflineManagement />
+                </div>
+
                 <Card className="mb-6 break-inside-avoid py-5">
                     <CardHeader>
                         <CardTitle>Appearance</CardTitle>