♻️ Better current track metadata

lib/providers/audio_provider.dart

@@ -1,4 +1,5 @@
 import 'package:groovybox/logic/audio_handler.dart';
+import 'package:groovybox/logic/metadata_service.dart';
 import 'package:riverpod_annotation/riverpod_annotation.dart';
 
 part 'audio_provider.g.dart';
@@ -15,3 +16,19 @@ AudioHandler audioHandler(Ref ref) {
 void setAudioHandler(AudioHandler handler) {
   _audioHandler = handler;
 }
+
+@Riverpod(keepAlive: true)
+class CurrentTrackMetadataNotifier extends _$CurrentTrackMetadataNotifier {
+  @override
+  TrackMetadata? build() {
+    return null;
+  }
+
+  void setMetadata(TrackMetadata metadata) {
+    state = metadata;
+  }
+
+  void clear() {
+    state = null;
+  }
+}