resolve issues with new features

frontend/src/pages/Fahrzeuge.tsx

@@ -9,7 +9,6 @@ import {
   Chip,
   CircularProgress,
   Container,
-  Fab,
   Grid,
   InputAdornment,
   TextField,
@@ -29,7 +28,7 @@ import {
 } from '@mui/icons-material';
 import { useNavigate } from 'react-router-dom';
 import DashboardLayout from '../components/dashboard/DashboardLayout';
-import { useLayout } from '../contexts/LayoutContext';
+import ChatAwareFab from '../components/shared/ChatAwareFab';
 import { vehiclesApi } from '../services/vehicles';
 import { equipmentApi } from '../services/equipment';
 import type { VehicleEquipmentWarning } from '../types/equipment.types';
@@ -272,7 +271,6 @@ const VehicleCard: React.FC<VehicleCardProps> = ({ vehicle, onClick, warnings =
 function Fahrzeuge() {
   const navigate = useNavigate();
   const { isAdmin } = usePermissions();
-  const { chatPanelOpen } = useLayout();
   const [vehicles, setVehicles] = useState<FahrzeugListItem[]>([]);
   const [loading, setLoading]   = useState(true);
   const [error, setError]       = useState<string | null>(null);
@@ -414,14 +412,12 @@ function Fahrzeuge() {
         )}
 
         {isAdmin && (
-          <Fab
-            color="primary"
+          <ChatAwareFab
             aria-label="Fahrzeug hinzufügen"
-            sx={{ position: 'fixed', bottom: 32, right: chatPanelOpen ? 376 : 80, transition: 'right 225ms cubic-bezier(0.4, 0, 0.6, 1)' }}
             onClick={() => navigate('/fahrzeuge/neu')}
           >
             <Add />
-          </Fab>
+          </ChatAwareFab>
         )}
       </Container>
     </DashboardLayout>