fix(flutter): 恢复播放器深色外观

lib/core/theme/app_colors.dart

@@ -91,6 +91,21 @@ abstract final class AppColors {
   /// 导航未选中。
   static const navUnselected = muted;
 
+  /// 播放器专用深色页面背景。
+  static const playerBackground = Color(0xFF0D0D10);
+
+  /// 播放器底部信息面板，保留轻微视频透出。
+  static const playerPanel = Color(0xED0D0D10);
+
+  /// 播放器次要文字。
+  static const playerMuted = Color(0xFFBBBBBB);
+
+  /// 播放器底栏胶囊。
+  static const playerChip = Color(0xFF1C1C1E);
+
+  /// 播放器面板分割线。
+  static const playerDivider = Color(0xFF2A2A2D);
+
   static const outlineDark = border;
   static const outlineVariantDark = border;
   static const outlineLight = muted;