fix(flutter): 恢复播放器深色外观

test/player/player_fullscreen_test.dart

@@ -191,12 +191,12 @@ void main() {
       tester
           .widget<ColoredBox>(find.byKey(const Key('player-background')))
           .color,
-      AppColors.ink,
+      AppColors.playerBackground,
     );
     final panel = tester.widget<Container>(
       find.byKey(const Key('player-controls-bottom')),
     );
-    expect((panel.decoration! as BoxDecoration).color, AppColors.card);
+    expect((panel.decoration! as BoxDecoration).color, AppColors.playerPanel);
 
     expect(bottom.height, lessThanOrEqualTo(200));
     expect(bottom.top, greaterThanOrEqualTo(screenHeight * 0.78));