refactor: trakt/download hardening and cleanup sweep

lib/mpv/models.dart

@@ -288,11 +288,7 @@ class Media {
   /// Optional start position for playback.
   final Duration? start;
 
-  /// Optional pre-known video frame rate (from server metadata), used to drive
-  /// display refresh-rate matching before the first frame renders.
-  final double? fps;
-
-  const Media(this.uri, {this.headers, this.start, this.fps});
+  const Media(this.uri, {this.headers, this.start});
 
   @override
   String toString() => 'Media($uri)';

lib/mpv/player/player_base.dart

@@ -487,11 +487,6 @@ abstract class PlayerBase with PlayerStreamControllersMixin implements Player {
     trackController.add(_state.track);
   }
 
-  /// Update the internal state.
-  void updateState(PlayerState Function(PlayerState) update) {
-    _state = update(_state);
-  }
-
   @protected
   void clearTracks() {
     const empty = Tracks();