Prepare Kalendartool for MPM and disable invites

components/calendar/CalendarModal.tsx

@@ -12,6 +12,7 @@
  *  - Loeschen ausschliesslich durch Admins (Server prueft final)
  *  - Legende: eigene vs. fremde Reservierungen
  */
+import { appFetch } from '@/lib/client-fetch';
 import { useCallback, useEffect, useMemo, useState } from 'react';
 import { ModalShell } from '@/components/ui/ModalShell';
 import { Button, ErrorMessage, Input, Label } from '@/components/ui/ui';
@@ -189,7 +190,7 @@ export function CalendarModal({
     setIsLoading(true);
     setError(null);
     try {
-      const response = await fetch(
+      const response = await appFetch(
         `/api/calendars/${calendarId}/reservations?from=${encodeURIComponent(window.from)}&to=${encodeURIComponent(window.to)}`,
       );
       if (!response.ok) {
@@ -231,7 +232,7 @@ export function CalendarModal({
     }
 
     try {
-      const response = await fetch(`/api/calendars/${calendarId}/reservations`, {
+      const response = await appFetch(`/api/calendars/${calendarId}/reservations`, {
         method: 'POST',
         headers: { 'Content-Type': 'application/json' },
         body: JSON.stringify({
@@ -261,7 +262,7 @@ export function CalendarModal({
     setDeletingId(reservationId);
     setError(null);
     try {
-      const response = await fetch(`/api/reservations/${reservationId}`, {
+      const response = await appFetch(`/api/reservations/${reservationId}`, {
         method: 'DELETE',
       });
       if (!response.ok) {