fix: Prevent redirect to login on dealer apply page during auth loading

Wait for isLoading to complete before checking user state to avoid
premature redirect when navigating from profile page.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/app/dealer/apply/page.tsx

@@ -27,7 +27,7 @@ interface DealerApplication {
 
 export default function DealerApplyPage() {
   const { t, language } = useTranslation();
-  const { user, token } = useAuthStore();
+  const { user, token, isLoading } = useAuthStore();
   const router = useRouter();
 
   const [loading, setLoading] = useState(false);
@@ -53,6 +53,8 @@ export default function DealerApplyPage() {
   });
 
   useEffect(() => {
+    if (isLoading) return;
+
     if (!user) {
       router.push('/login');
       return;
@@ -65,7 +67,7 @@ export default function DealerApplyPage() {
 
     // Check for existing application
     checkExistingApplication();
-  }, [user, router]);
+  }, [user, router, isLoading]);
 
   const checkExistingApplication = async () => {
     if (!token) return;
@@ -121,7 +123,7 @@ export default function DealerApplyPage() {
     }
   };
 
-  if (!user || checkingApplication) {
+  if (isLoading || !user || checkingApplication) {
     return (
       <div className="min-h-screen bg-gray-50 flex items-center justify-center">
         <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-primary-600"></div>