fix: adopt response format of bpn personal data endpoint

src/Controller/Account/PersonalDataController.php

@@ -8,6 +8,7 @@ use App\BusProNet\ApiClient;
 use App\BusProNet\Exception\ApiClientException;
 use App\BusProNet\Model\Notification;
 use App\BusProNet\Model\PersonalData;
+use App\BusProNet\Model\PersonalDataUpdateResponse;
 use App\Entity\User;
 use App\Exception\NewsletterProviderException;
 use App\Form\PersonalDataType;
@@ -104,6 +105,16 @@ class PersonalDataController extends AbstractController
                     return $this->redirectToRoute('app_personal_data');
                 }
 
+                if ($updateResult instanceof PersonalDataUpdateResponse && false === $updateResult->changed) {
+                    $this->logger->error('BPN did not apply personal data update', [
+                        'email' => $user->getEmail(),
+                        'addressId' => $updateResult->addressId,
+                    ]);
+                    $this->addFlash('error', 'Deine persönlichen Daten konnten nicht aktualisiert werden. Bitte versuche es erneut.');
+
+                    return $this->redirectToRoute('app_personal_data');
+                }
+
                 // Invalidate cached bookings to ensure edit mode shows updated applicant data
                 $this->dataLoader->invalidateUserBookingCaches($user);