fix(recommend): 精简底部信息并优化进度拖动

lib/core/theme/app_colors.dart

@@ -24,6 +24,7 @@ abstract final class AppColors {
   static const overlayMedium = Color(0x99000000);
   static const headerScrim = Color(0x59000000);
   static const overlaySecondary = Color(0xFFC7C7CC);
+  static const overlayLabel = Color(0xFFE6E6EB);
 
   /// 主操作、选中态、播放进度（品牌橙）。
   static const blue = Color(0xFFFF6B2C);