feat: improved promotional and purchase vouchers

src/Controller/Booking/Create/Step2Controller.php

@@ -150,10 +150,20 @@ class Step2Controller extends AbstractController
 
         $form->handleRequest($request);
 
+        // Collect notifications from field handlers (run during PRE_SUBMIT)
+        $notifications = $this->collectAndClearNotifications($bookingDto);
+
         if (true === $form->isSubmitted() && true === $form->isValid()) {
             // Save BookingDto to session
             $this->bookingService->saveBookingDto($request, $bookingDto, BookingDto::MODE_CREATE);
 
+            // Add notifications as flash messages (redirects destroy HTMX-triggered toasts)
+            if (false === empty($notifications)) {
+                foreach ($notifications as $notification) {
+                    $this->addFlash($notification['type'], $notification['message']);
+                }
+            }
+
             // HTMX redirect to cards view
             return $this->hxRedirect($request, $this->generateUrl('app_booking_create_step_2'));
         }
@@ -174,12 +184,21 @@ class Step2Controller extends AbstractController
 
         // HTMX request: render blocks only with OOB swap
         if ($this->isHxRequest($request)) {
-            return $this->htmxOobResponse(
+            $response = $this->htmxOobResponse(
                 'booking/_participant_form.html.twig',
                 ['participant_form', 'booking_summary'],
                 $templateData,
                 $this->generateUrl('app_booking_create_step_2_participant', ['index' => $index])
             );
+
+            // Add notifications to render response if present
+            if (false === empty($notifications)) {
+                $response->headers->set('HX-Trigger', json_encode([
+                    'showNotifications' => $notifications,
+                ]));
+            }
+
+            return $response;
         }
 
         // Regular request: render full template

src/Controller/Booking/Create/Step3Controller.php

@@ -76,17 +76,22 @@ class Step3Controller extends AbstractController
                     return $this->handleApiError(
                         'Booking inquiry failed',
                         ['message' => $inquiryResponse->message],
-                        'Ein Fehler ist aufgetreten. Bitte versuchen Sie es erneut.',
+                        $inquiryResponse->message ?? 'Ein Fehler ist aufgetreten. Bitte versuchen Sie es erneut.',
                         $bookingCreateDto,
                         $form
                     );
                 }
 
                 if (false === $inquiryResponse->isInquiryValid()) {
+                    $errorMessage = 'Buchung konnte nicht validiert werden.';
+                    if (null !== $inquiryResponse->message && '' !== trim($inquiryResponse->message)) {
+                        $errorMessage .= ' '.$inquiryResponse->message;
+                    }
+
                     return $this->handleApiError(
                         'Booking inquiry validation failed',
-                        ['status' => $inquiryResponse->status],
-                        'Buchung konnte nicht validiert werden.',
+                        ['status' => $inquiryResponse->status, 'message' => $inquiryResponse->message],
+                        $errorMessage,
                         $bookingCreateDto,
                         $form
                     );

src/Controller/Booking/Create/Step4Controller.php

@@ -76,17 +76,22 @@ class Step4Controller extends AbstractController
                     return $this->handleApiError(
                         'Booking creation failed - API notification',
                         ['message' => $bookingResponse->message],
-                        $bookingResponse->message,
+                        $bookingResponse->message ?? 'Ein Fehler ist aufgetreten. Bitte versuchen Sie es erneut.',
                         $bookingCreateDto,
                         $form
                     );
                 }
 
                 if (false === $bookingResponse->isBookingSuccessful()) {
+                    $errorMessage = 'Buchung konnte nicht erstellt werden.';
+                    if (null !== $bookingResponse->message && '' !== trim($bookingResponse->message)) {
+                        $errorMessage .= ' '.$bookingResponse->message;
+                    }
+
                     return $this->handleApiError(
                         'Booking creation unsuccessful',
-                        ['status' => $bookingResponse->status],
-                        'Buchung konnte nicht erstellt werden.',
+                        ['status' => $bookingResponse->status, 'message' => $bookingResponse->message],
+                        $errorMessage,
                         $bookingCreateDto,
                         $form
                     );