Prepare Kalendartool for MPM and disable invites

components/layout/Sidebar.tsx

@@ -11,6 +11,7 @@
  * Der Zustand wird in localStorage persistiert, damit die Wahl
  * ueber Seitenwechsel hinweg erhalten bleibt.
  */
+import { appFetch } from '@/lib/client-fetch';
 import { useEffect, useState } from 'react';
 import Link from 'next/link';
 import { usePathname, useRouter } from 'next/navigation';
@@ -115,7 +116,7 @@ export function Sidebar({
   async function logout() {
     setIsLoggingOut(true);
     try {
-      await fetch('/api/auth/logout', { method: 'POST' });
+      await appFetch('/api/auth/logout', { method: 'POST' });
       router.push('/login');
       router.refresh();
     } finally {
@@ -140,7 +141,7 @@ export function Sidebar({
             Kalendartool
           </span>
         )}
-        <button
+        {process.env.NEXT_PUBLIC_MPM_AUTH_MODE !== 'true' && <button
           type="button"
           onClick={toggleCollapsed}
           aria-expanded={!isCollapsed}
@@ -148,7 +149,7 @@ export function Sidebar({
           className="rounded-md p-2 text-slate-500 transition-colors hover:bg-slate-100 hover:text-slate-700 dark:text-slate-400 dark:hover:bg-slate-800 dark:hover:text-slate-200"
         >
           {isCollapsed ? '»' : '«'}
-        </button>
+        </button>}
       </div>
 
       <nav className="flex-1 space-y-1 overflow-y-auto p-2">
@@ -231,4 +232,4 @@ export function Sidebar({
       )}
     </aside>
   );
-}
+}