bug fix for atemschutz

frontend/src/components/shared/Sidebar.tsx

@@ -14,6 +14,9 @@ import {
   Build,
   People,
   Air,
+  Event,
+  BookOnline,
+  CalendarMonth,
 } from '@mui/icons-material';
 import { useNavigate, useLocation } from 'react-router-dom';
 
@@ -31,11 +34,26 @@ const navigationItems: NavigationItem[] = [
     icon: <DashboardIcon />,
     path: '/dashboard',
   },
+  {
+    text: 'Kalender',
+    icon: <CalendarMonth />,
+    path: '/kalender',
+  },
+  {
+    text: 'Veranstaltungen',
+    icon: <Event />,
+    path: '/veranstaltungen',
+  },
   {
     text: 'Fahrzeuge',
     icon: <DirectionsCar />,
     path: '/fahrzeuge',
   },
+  {
+    text: 'Fahrzeugbuchungen',
+    icon: <BookOnline />,
+    path: '/fahrzeugbuchungen',
+  },
   {
     text: 'Ausrüstung',
     icon: <Build />,