fix(player): 优化加载指示器与锁定进度条

lib/pages/player/widgets/loading_progress_track.dart

@@ -2,15 +2,13 @@
 
 import 'package:flutter/material.dart';
 
-import '../../../core/theme/app_colors.dart';
-
 /// 播放未就绪时沿进度轨道循环移动的加载高光。
 class LoadingProgressTrack extends StatefulWidget {
   const LoadingProgressTrack({
     super.key = const Key('progress-loading'),
     required this.height,
     this.trackColor = Colors.white24,
-    this.highlightColor = AppColors.blue,
+    this.highlightColor = Colors.white,
   });
 
   final double height;