feat: add search filters for Deezer default search

- Add filter parameter to Deezer SearchAll (track/artist/album/playlist)
- When filter is specified, increase limit for that type only
- Add default Deezer filters when not using extension search
- Reduce artist limit from 5 to 2 in home search results
- Filter bar now shows for both extension and default Deezer search
- Fix filter not being passed correctly during search (preserve filter state)

lib/services/platform_bridge.dart

@@ -343,11 +343,12 @@ class PlatformBridge {
     await _channel.invokeMethod('clearTrackCache');
   }
 
-  static Future<Map<String, dynamic>> searchDeezerAll(String query, {int trackLimit = 15, int artistLimit = 3}) async {
+  static Future<Map<String, dynamic>> searchDeezerAll(String query, {int trackLimit = 15, int artistLimit = 2, String? filter}) async {
     final result = await _channel.invokeMethod('searchDeezerAll', {
       'query': query,
       'track_limit': trackLimit,
       'artist_limit': artistLimit,
+      'filter': filter ?? '',
     });
     return jsonDecode(result as String) as Map<String, dynamic>;
   }