fix(flutter): 简介灰字统一并透明暂停按钮

test/player/player_center_toggle_test.dart

@@ -33,16 +33,16 @@ void main() {
       Key('player-play-toggle'),
     ]) {
       expect(tester.getSize(find.byKey(key)), const Size(52, 52));
-      final container = tester.widget<Container>(
+      // 暂停按钮改为透明背景，容器已不再绘制任何底色或装饰。
+      expect(
         find.descendant(of: find.byKey(key), matching: find.byType(Container)),
+        findsNothing,
       );
-      final decoration = container.decoration! as BoxDecoration;
-      expect(decoration.color, AppColors.blue);
-      expect(decoration.shape, BoxShape.circle);
       final icon = tester.widget<Icon>(
         find.descendant(of: find.byKey(key), matching: find.byType(Icon)),
       );
       expect(icon.size, 26);
+      expect(icon.color, AppColors.onPrimary);
     }
   });
 }