feat: quality picker with track info, update dialog redesign, finalizing notification fix

- Quality picker now shows track name, artist, and cover
- Tap to expand long track titles (icon only shows when truncated)
- Ripple effect follows rounded corners including drag handle
- Update dialog redesigned with Material Expressive 3 style
- Fixed update notification stuck at 100% after download complete
- Ask before download now enabled by default
- Finalizing notification for multi-progress polling

lib/services/notification_service.dart

@@ -98,6 +98,49 @@ class NotificationService {
     );
   }
 
+  Future<void> showDownloadFinalizing({
+    required String trackName,
+    required String artistName,
+  }) async {
+    if (!_isInitialized) await initialize();
+
+    final androidDetails = AndroidNotificationDetails(
+      channelId,
+      channelName,
+      channelDescription: channelDescription,
+      importance: Importance.low,
+      priority: Priority.low,
+      showProgress: true,
+      maxProgress: 100,
+      progress: 100,
+      indeterminate: false,
+      ongoing: true,
+      autoCancel: false,
+      playSound: false,
+      enableVibration: false,
+      onlyAlertOnce: true,
+      icon: '@mipmap/ic_launcher',
+    );
+
+    const iosDetails = DarwinNotificationDetails(
+      presentAlert: false,
+      presentBadge: false,
+      presentSound: false,
+    );
+
+    final details = NotificationDetails(
+      android: androidDetails,
+      iOS: iosDetails,
+    );
+
+    await _notifications.show(
+      downloadProgressId,
+      'Finalizing $trackName',
+      '$artistName • Embedding metadata...',
+      details,
+    );
+  }
+
   Future<void> showDownloadComplete({
     required String trackName,
     required String artistName,

lib/services/platform_bridge.dart

@@ -26,6 +26,16 @@ class PlatformBridge {
     return jsonDecode(result as String) as Map<String, dynamic>;
   }
 
+  /// Search Spotify for tracks and artists
+  static Future<Map<String, dynamic>> searchSpotifyAll(String query, {int trackLimit = 15, int artistLimit = 3}) async {
+    final result = await _channel.invokeMethod('searchSpotifyAll', {
+      'query': query,
+      'track_limit': trackLimit,
+      'artist_limit': artistLimit,
+    });
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
   /// Check track availability on streaming services
   static Future<Map<String, dynamic>> checkAvailability(String spotifyId, String isrc) async {
     final result = await _channel.invokeMethod('checkAvailability', {