Prepare Kalendartool for MPM and disable invites

components/auth/LogoutButton.tsx

@@ -1,6 +1,7 @@
 'use client';
 
 /** Logout-Button: beendet die Session per API und laedt neu. */
+import { appFetch } from '@/lib/client-fetch';
 import { useRouter } from 'next/navigation';
 import { Button } from '@/components/ui/ui';
 
@@ -8,7 +9,7 @@ export function LogoutButton() {
   const router = useRouter();
 
   async function logout() {
-    await fetch('/api/auth/logout', { method: 'POST' });
+    await appFetch('/api/auth/logout', { method: 'POST' });
     router.push('/login');
     router.refresh();
   }