fix(flutter): 修复首页冷启动灰屏

test/player/player_fullscreen_test.dart

@@ -13,6 +13,7 @@ import 'package:fruitshorts/core/data/repositories/favorite_repository.dart';
 import 'package:fruitshorts/core/data/repositories/playback_repository.dart';
 import 'package:fruitshorts/core/data/repositories/watch_history_repository.dart';
 import 'package:fruitshorts/core/theme/app_colors.dart';
+import 'package:fruitshorts/core/widgets/remote_image.dart';
 import 'package:fruitshorts/pages/player/widgets/player_center_toggle.dart';
 import 'package:fruitshorts/pages/player/widgets/seek_progress_bar.dart';
 
@@ -333,11 +334,17 @@ void main() {
     final fallback = find.byKey(const Key('player-fallback-background'));
     expect(fallback, findsOneWidget);
     expect(find.byKey(const Key('player-fallback-cover')), findsOneWidget);
+    expect(
+      tester
+          .widget<RemoteImage>(find.byKey(const Key('player-fallback-cover')))
+          .fallbackColor,
+      Colors.black,
+    );
     expect(
       tester
           .widget<ColoredBox>(find.byKey(const Key('player-fallback-scrim')))
           .color,
-      const Color(0x66000000),
+      const Color(0x4D000000),
     );
     expect(
       tester