fix(user-center): restore ajax tab navigation

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

assets/css/routes/user-center/responsive.css

@@ -10,9 +10,8 @@
 @media (max-width: 767px) {
   .uc-mobile-tabs {
     display: flex;
-    flex-wrap: nowrap;
-    overflow-x: auto;
-    overflow-y: hidden;
+    flex-wrap: wrap;
+    overflow: hidden;
     gap: 4px;
     padding-bottom: 12px;
     margin-bottom: 16px;