fix(player): 优化加载指示器与锁定进度条

lib/pages/player/widgets/player_overlay_models.dart

@@ -23,6 +23,7 @@ class PlayerOverlayData {
     required this.playbackSpeed,
     required this.totalEpisodes,
     required this.boosting,
+    required this.locked,
     this.authorNote = '',
   });
 
@@ -65,6 +66,9 @@ class PlayerOverlayData {
   /// 是否处于长按加速态。
   final bool boosting;
 
+  /// 当前剧集是否锁定。
+  final bool locked;
+
   /// 作者声明；没有后端字段时为空。
   final String authorNote;
 }