feat: correo via banco mail, rol supervisor y lint en cero

frontend/src/app/(app)/settings/departments/page.tsx

@@ -38,13 +38,18 @@ export default function DepartmentsPage() {
   }, []);
 
   useEffect(() => {
-    if (authLoading) return;
-    if (user?.role !== "admin") {
-      setLoading(false);
-      return;
-    }
-    fetchGroups();
-  }, [fetchGroups, authLoading, user?.role]);
+    if (authLoading || user?.role !== "admin") return;
+    getGroups()
+      .then((g) => {
+        setGroups(g);
+        setError("");
+      })
+      .catch((err) => {
+        setError(err instanceof Error ? err.message : "Error al cargar");
+        setGroups([]);
+      })
+      .finally(() => setLoading(false));
+  }, [authLoading, user?.role]);
 
   const openCreate = () => {
     setEditing(null);