calendar and vehicle booking rework

frontend/src/pages/Kalender.tsx

@@ -64,6 +64,7 @@ import {
 } from '@mui/icons-material';
 import { useNavigate } from 'react-router-dom';
 import DashboardLayout from '../components/dashboard/DashboardLayout';
+import ServiceModePage from '../components/shared/ServiceModePage';
 import ChatAwareFab from '../components/shared/ChatAwareFab';
 import { toGermanDateTime, fromGermanDate, fromGermanDateTime } from '../utils/dateInput';
 
@@ -1625,7 +1626,7 @@ function VeranstaltungFormDialog({
 
 export default function Kalender() {
   const navigate = useNavigate();
-  const { hasPermission } = usePermissionContext();
+  const { hasPermission, isFeatureEnabled } = usePermissionContext();
   const notification = useNotification();
   const theme = useTheme();
   const isMobile = useMediaQuery(theme.breakpoints.down('sm'));
@@ -1873,6 +1874,10 @@ export default function Kalender() {
 
   // ── Render ───────────────────────────────────────────────────────────────────
 
+  if (!isFeatureEnabled('kalender')) {
+    return <ServiceModePage message="Der Kalender befindet sich aktuell im Wartungsmodus." />;
+  }
+
   return (
     <DashboardLayout>
       <Box sx={{ maxWidth: 1100, mx: 'auto' }}>