update

frontend/src/pages/FahrzeugForm.tsx

@@ -13,6 +13,7 @@ import {
 import { ArrowBack, Save } from '@mui/icons-material';
 import { useNavigate, useParams } from 'react-router-dom';
 import DashboardLayout from '../components/dashboard/DashboardLayout';
+import GermanDateField from '../components/shared/GermanDateField';
 import { vehiclesApi } from '../services/vehicles';
 import {
   CreateFahrzeugPayload,
@@ -272,24 +273,20 @@ function FahrzeugForm() {
           <Typography variant="h6" gutterBottom sx={{ mt: 3 }}>Prüf- und Wartungsfristen</Typography>
           <Grid container spacing={2}>
             <Grid item xs={12} sm={6}>
-              <TextField
+              <GermanDateField
                 label="§57a fällig am"
                 fullWidth
-                type="date"
                 value={form.paragraph57a_faellig_am}
-                onChange={(e) => setForm((prev) => ({ ...prev, paragraph57a_faellig_am: e.target.value }))}
-                InputLabelProps={{ shrink: true }}
+                onChange={(iso) => setForm((prev) => ({ ...prev, paragraph57a_faellig_am: iso }))}
                 helperText="Periodische Begutachtung (§57a StVO)"
               />
             </Grid>
             <Grid item xs={12} sm={6}>
-              <TextField
+              <GermanDateField
                 label="Nächste Wartung am"
                 fullWidth
-                type="date"
                 value={form.naechste_wartung_am}
-                onChange={(e) => setForm((prev) => ({ ...prev, naechste_wartung_am: e.target.value }))}
-                InputLabelProps={{ shrink: true }}
+                onChange={(iso) => setForm((prev) => ({ ...prev, naechste_wartung_am: iso }))}
                 helperText="Nächster geplanter Servicetermin"
               />
             </Grid>