feat: improved error handling of xml parsers and loaders

src/Controller/Booking/CreateStep1Controller.php

@@ -36,8 +36,6 @@ class CreateStep1Controller extends AbstractController
         try {
             $bookingCreateDto = $this->bookingService->getOrCreateBookingCreateDto($request);
         } catch (NoRoomsAvailableException $e) {
-            $this->addFlash('error', 'Leider sind für diese Reise aktuell keine Zimmer verfügbar.');
-            // TODO: Redirect to travel listing or hotel details page
             throw $this->createNotFoundException('No rooms available for this travel.');
         }
 
@@ -93,8 +91,7 @@ class CreateStep1Controller extends AbstractController
         try {
             $bookingCreateDto = $this->bookingService->getOrCreateBookingCreateDto($request);
         } catch (NoRoomsAvailableException $e) {
-            // For HTMX requests, return a simple error message
-            return new Response('<div class="text-red-700 p-4">Keine Zimmer verfügbar</div>', 400);
+            throw $this->createNotFoundException('No rooms available for this travel.');
         }
 
         // Process the form to update the DTO with the latest room selection