Prepare Kalendartool for MPM and disable invites

components/profile/ProfileModal.tsx

@@ -11,6 +11,7 @@
  * Wird aus der Sidebar ueber das Profil-Badge geoeffnet; nach dem
  * Speichern aktualisiert router.refresh() die Sidebar sofort.
  */
+import { appFetch } from '@/lib/client-fetch';
 import { useCallback, useEffect, useState } from 'react';
 import { useRouter } from 'next/navigation';
 import { Button, ErrorMessage, Input, Label, Badge } from '@/components/ui/ui';
@@ -35,7 +36,7 @@ export function ProfileModal({ onClose }: { onClose: () => void }) {
     setIsLoading(true);
     setError(null);
     try {
-      const response = await fetch('/api/me/profile', { cache: 'no-store' });
+      const response = await appFetch('/api/me/profile', { cache: 'no-store' });
       if (!response.ok) {
         throw new Error('Profil konnte nicht geladen werden.');
       }
@@ -66,7 +67,7 @@ export function ProfileModal({ onClose }: { onClose: () => void }) {
     const username = String(formData.get('username') ?? '').trim();
 
     try {
-      const response = await fetch('/api/me/profile', {
+      const response = await appFetch('/api/me/profile', {
         method: 'PATCH',
         headers: { 'Content-Type': 'application/json' },
         body: JSON.stringify({ username: username || null }),