style(theme): 客户端切换深色视觉风格

lib/pages/player/widgets/player_center_toggle.dart

@@ -6,9 +6,9 @@ import '../../../core/theme/app_colors.dart';
 
 const double _toggleSize = 68;
 const double _iconSize = 36;
-const Color _toggleBackground = Colors.black26;
+const Color _toggleBackground = AppColors.controlSoftScrim;
 const List<Shadow> _iconShadows = [
-  Shadow(color: Colors.black54, blurRadius: 12),
+  Shadow(color: AppColors.shadow, blurRadius: 12),
 ];
 
 /// 首页沉浸流与全屏播放器共用的播放/暂停按钮。