feat(app): 完善播放协议搜索与空状态

lib/pages/auth/auth_form_widgets.dart

@@ -336,7 +336,6 @@ class _AuthBrand extends StatelessWidget {
     key: const Key('auth-brand-mark'),
     size: compact ? _compactBrandMarkSize : _brandMarkSize,
     radius: compact ? _compactBrandMarkRadius : _brandMarkRadius,
-    iconSize: compact ? _compactBrandIconSize : _brandIconSize,
   );
 
   Widget _brandCopy(BuildContext context, {required bool centered}) => Column(