resolve issues with new features

frontend/src/pages/FahrzeugDetail.tsx

@@ -12,7 +12,6 @@ import {
   DialogContentText,
   DialogTitle,
   Divider,
-  Fab,
   FormControl,
   Grid,
   IconButton,
@@ -55,7 +54,7 @@ import {
 } from '@mui/icons-material';
 import { useNavigate, useParams } 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 { fromGermanDate } from '../utils/dateInput';
 import { equipmentApi } from '../services/equipment';
@@ -323,7 +322,6 @@ const WARTUNG_ART_ICONS: Record<string, React.ReactElement> = {
 };
 
 const WartungTab: React.FC<WartungTabProps> = ({ fahrzeugId, wartungslog, onAdded, canWrite }) => {
-  const { chatPanelOpen } = useLayout();
   const [dialogOpen, setDialogOpen] = useState(false);
   const [saving, setSaving]         = useState(false);
   const [saveError, setSaveError]   = useState<string | null>(null);
@@ -396,15 +394,13 @@ const WartungTab: React.FC<WartungTabProps> = ({ fahrzeugId, wartungslog, onAdde
       )}
 
       {canWrite && (
-        <Fab
-          color="primary"
+        <ChatAwareFab
           size="small"
           aria-label="Wartung eintragen"
-          sx={{ position: 'fixed', bottom: 32, right: chatPanelOpen ? 376 : 80, transition: 'right 225ms cubic-bezier(0.4, 0, 0.6, 1)' }}
           onClick={() => { setForm(emptyForm); setDialogOpen(true); }}
         >
           <Add />
-        </Fab>
+        </ChatAwareFab>
       )}
 
       <Dialog open={dialogOpen} onClose={() => setDialogOpen(false)} maxWidth="sm" fullWidth>