hotfix: ProtectedRoute allows access for system_admin + empty permissions + /kein-zugriff route + NoAccessPage

frontend/src/components/common/ProtectedRoute.tsx

@@ -1,6 +1,7 @@
 import React from 'react';
 import { Navigate } from 'react-router-dom';
 import { usePermission } from '@/hooks/usePermission';
+import { useAuthStore } from '@/store/authStore';
 
 interface ProtectedRouteProps {
   permission: string;
@@ -9,6 +10,19 @@ interface ProtectedRouteProps {
 
 export function ProtectedRoute({ permission, children }: ProtectedRouteProps) {
   const { hasPermission } = usePermission();
+  const user = useAuthStore((state) => state.user);
+
+  // If user is system admin, always allow
+  if (user?.is_system_admin) {
+    return <>{children}</>;
+  }
+
+  // If permissions array is empty or not loaded yet, allow access
+  // (better to show page and let backend 403 handle it than block everything)
+  const perms = user?.permissions || [];
+  if (perms.length === 0) {
+    return <>{children}</>;
+  }
 
   if (!hasPermission(permission)) {
     return <Navigate to="/kein-zugriff" replace />;

frontend/src/pages/NoAccessPage.tsx

@@ -0,0 +1,22 @@
+import React from 'react';
+import { Link } from 'react-router-dom';
+import { ShieldX } from 'lucide-react';
+
+export default function NoAccessPage() {
+  return (
+    <div className="flex flex-col items-center justify-center min-h-screen bg-secondary-50 p-4">
+      <ShieldX className="w-16 h-16 text-secondary-400 mb-4" strokeWidth={1.5} />
+      <h1 className="text-2xl font-bold text-secondary-700 mb-2">Kein Zugriff</h1>
+      <p className="text-secondary-500 mb-6 text-center max-w-md">
+        Sie haben keine Berechtigung, auf diese Seite zuzugreifen.
+        Bitte wenden Sie sich an einen Administrator, falls Sie Zugriff benötigen.
+      </p>
+      <Link
+        to="/dashboard"
+        className="px-4 py-2 bg-primary-600 text-white rounded-md hover:bg-primary-700 transition-colors"
+      >
+        Zum Dashboard
+      </Link>
+    </div>
+  );
+}

frontend/src/routes/index.tsx

@@ -64,6 +64,7 @@ const ActivityTimelinePage = React.lazy(() => import('@/pages/ActivityTimeline')
 const SettingsWebhooksPage = React.lazy(() => import('@/pages/SettingsWebhooks').then(m => ({ default: m.SettingsWebhooksPage })));
 const SettingsBackupPage = React.lazy(() => import('@/pages/SettingsBackup').then(m => ({ default: m.SettingsBackupPage })));
 const SettingsRechtePage = React.lazy(() => import('@/pages/SettingsRechte').then(m => ({ default: m.SettingsRechtePage })));
+const NoAccessPage = React.lazy(() => import('@/pages/NoAccessPage').then(m => ({ default: m.NoAccessPage })));
 
 /** Centered spinner fallback for lazy-loaded routes */
 function PageLoader() {
@@ -120,6 +121,10 @@ const router = createBrowserRouter([
     path: '/guest/contacts',
     element: <GuestContactsPage />,
   },
+  {
+    path: '/kein-zugriff',
+    element: <ErrorBoundary>{withSuspense(<NoAccessPage />)}</ErrorBoundary>,
+  },
   {
     element: (
       <ProtectedRoute>