fix(player): 优化加载指示器与锁定进度条

test/player/loading_progress_track_test.dart

@@ -3,7 +3,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
-import 'package:fruitshorts/core/theme/app_colors.dart';
 import 'package:fruitshorts/pages/player/widgets/loading_progress_track.dart';
 
 void main() {
@@ -37,7 +36,7 @@ void main() {
             find.byKey(const Key('progress-loading-highlight')),
           )
           .color,
-      AppColors.blue,
+      Colors.white,
     );
 
     final initialLeft = tester