feat(app): 完善播放协议搜索与空状态

lib/pages/mine/widgets/mine_header.dart

@@ -14,7 +14,7 @@ import '../../../core/widgets/remote_image.dart';
 import '../../../l10n/app_localizations.dart';
 
 const double _buttonHeight = 34;
-const double _buttonRadius = 20;
+const double _buttonRadius = 6;
 
 /// 「我的」页用户区。
 class MineHeader extends StatelessWidget {