feat: enable entering additional remarks in offer confirmation

src/Controller/Admin/AccommodationBooking/SendAccessLinkController.php

@@ -35,6 +35,14 @@ class SendAccessLinkController extends AbstractController
                 throw $this->createAccessDeniedException('Invalid CSRF token.');
             }
 
+            // Older bookings can still be missing their contact data. Sending would be
+            // silently skipped further down, so say so instead of reporting success.
+            if (null === $booking->getEmail() || '' === trim($booking->getEmail())) {
+                $this->addFlash('error', 'Für diese Buchung ist keine E-Mail-Adresse hinterlegt. Bitte ergänze sie, um den Zugangslink zu senden.');
+
+                return new HxRedirectResponse($this->generateUrl('app_admin_accommodationbooking_edit', ['id' => $booking->getId()]));
+            }
+
             $this->bookingService->sendCustomerConfirmationEmail($booking);
 
             $this->addFlash('success', 'Der Zugangslink wurde dem Kunden per E-Mail zugestellt.');

src/Controller/Groups/OfferController.php

@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace App\Controller\Groups;
 
 use App\Entity\Groups\AccommodationBooking;
+use App\Form\Model\OfferAcceptDto;
 use App\Form\OfferAcceptConfirmationType;
 use App\Htmx\HxTrait;
 use App\Model\AccommodationBookingContext;
@@ -97,13 +98,16 @@ class OfferController extends AbstractController
             return $this->redirectToOfferPage($request, $uuid);
         }
 
-        $confirmationForm = $this->createForm(OfferAcceptConfirmationType::class, null, [
+        $dto = new OfferAcceptDto(remarks: $booking->getRemarks());
+        $confirmationForm = $this->createForm(OfferAcceptConfirmationType::class, $dto, [
             'terms_url' => $this->termsUrlProvider->forAccommodation($booking->getAccommodation()),
         ]);
         $confirmationForm->handleRequest($request);
 
         if ($confirmationForm->isSubmitted() && $confirmationForm->isValid()) {
-            $this->bookingService->acceptBooking($booking);
+            // The textarea is prefilled, so the submitted value is the complete remark —
+            // an emptied field arrives as null and must clear the stored one, not keep it.
+            $this->bookingService->acceptBooking($booking, $dto->remarks ?? '');
             $this->addFlash('success', 'Deine Buchung ist bestätigt.');
 
             return $this->redirectToOfferPage($request, $uuid);