fix user validation fallback

src/components/UserManagementView.tsx

@@ -17,6 +17,7 @@ export function UserManagementView({ session }: UserManagementViewProps) {
   const [users, setUsers] = useState<User[]>([]);
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
+  const [warning, setWarning] = useState<string | null>(null);
   const [search, setSearch] = useState('');
   const [processingId, setProcessingId] = useState<string | null>(null);
   const [deleteConfirmUser, setDeleteConfirmUser] = useState<User | null>(null);
@@ -24,6 +25,7 @@ export function UserManagementView({ session }: UserManagementViewProps) {
   const fetchUsers = async () => {
     setLoading(true);
     setError(null);
+    setWarning(null);
     try {
       const res = await fetch('/api/users-admin', {
         method: 'POST',
@@ -41,6 +43,7 @@ export function UserManagementView({ session }: UserManagementViewProps) {
 
       const data = await res.json();
       setUsers(data.users || []);
+      setWarning(data.warning || null);
     } catch (err: any) {
       console.error('[UserManagement] fetch error:', err);
       setError(err.message || 'Error fetching user list.');
@@ -56,6 +59,7 @@ export function UserManagementView({ session }: UserManagementViewProps) {
   const handleToggleValidation = async (user: User, approve: boolean) => {
     setProcessingId(user.id);
     setError(null);
+    setWarning(null);
     try {
       const res = await fetch('/api/users-admin', {
         method: 'POST',
@@ -76,6 +80,8 @@ export function UserManagementView({ session }: UserManagementViewProps) {
         throw new Error(data.error || 'Failed to update user approval status.');
       }
 
+      const data = await res.json().catch(() => ({}));
+
       // Update local state
       setUsers(prev => prev.map(u => {
         if (u.id === user.id) {
@@ -83,6 +89,9 @@ export function UserManagementView({ session }: UserManagementViewProps) {
         }
         return u;
       }));
+      if (data.warning) {
+        setWarning(data.warning);
+      }
     } catch (err: any) {
       setError(err.message || 'Error updating approval status.');
     } finally {
@@ -183,6 +192,21 @@ export function UserManagementView({ session }: UserManagementViewProps) {
           </div>
         )}
 
+        {warning && (
+          <div className="mb-6 p-4 bg-amber-950/30 border border-amber-500/30 rounded-lg flex items-start gap-3">
+            <AlertCircle className="w-5 h-5 text-amber-400 shrink-0 mt-0.5" />
+            <div className="flex-1 text-sm text-amber-200">
+              <span className="font-semibold">Aviso:</span> {warning}
+            </div>
+            <button
+              onClick={() => setWarning(null)}
+              className="text-amber-300 hover:text-amber-200 text-xs font-semibold px-2 py-1 rounded"
+            >
+              Descartar
+            </button>
+          </div>
+        )}
+
         {loading ? (
           <div className="h-64 flex flex-col items-center justify-center text-slate-400">
             <Loader2 className="w-8 h-8 animate-spin text-blue-500 mb-3" />