fix: skip auth queries on public pages (register/login)

The GET_USER_DATA query includes restrictionLevel which has @auth directive.
This was causing authentication errors on /register and /login pages where
users are not yet authenticated.

Solution:
- Skip the GraphQL query when on public pages (/register or /login)
- Use useEffect to set loading=false immediately for public pages
- Add onError handler to gracefully handle query failures

Fixes authentication error: 'Message: Authentication failed, Path: restrictionLevel'

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

packages/admin-ui/src/Main.jsx

@@ -33,7 +33,18 @@ const Main = () => {
   const [loading, setLoading] = useState(true)
   const [restrictionLevel, setRestrictionLevel] = useState(null)
 
+  // Skip auth queries on unauthenticated pages (like /register and /login)
+  const isPublicPage = location.startsWith('/register') || location.startsWith('/login')
+
+  // Set loading to false immediately for public pages
+  React.useEffect(() => {
+    if (isPublicPage) {
+      setLoading(false)
+    }
+  }, [isPublicPage])
+
   useQuery(GET_USER_DATA, {
+    skip: isPublicPage,
     onCompleted: userResponse => {
       if (!userData && userResponse?.userData) {
         setUserData(userResponse.userData)
@@ -43,6 +54,10 @@ const Main = () => {
       }
       setLoading(false)
     },
+    onError: () => {
+      // If query fails, just mark as not loading
+      setLoading(false)
+    },
   })
 
   const sidebar = hasSidebar(location)