wip: major refactoring

src/Controller/Booking/CreateStep1Controller.php

@@ -34,8 +34,8 @@ class CreateStep1Controller extends AbstractController
     {
         $bookingCreateDto = $this->bookingService->getOrCreateBookingCreateDto($request);
 
-        // Capture the current room selection state before form processing
-        $oldRoomSelectionSnapshot = $this->bookingService->createRoomSelectionSnapshot($bookingCreateDto);
+        // Get or create baseline snapshot for change detection
+        $oldRoomSelectionSnapshot = $this->bookingService->getOrCreateBaselineSnapshot($request, $bookingCreateDto);
 
         $summary = $this->bookingService->getRoomSummaryAndParticipantCount($bookingCreateDto);
 
@@ -52,9 +52,13 @@ class CreateStep1Controller extends AbstractController
             if ($this->bookingService->hasRoomSelectionChanged($oldRoomSelectionSnapshot, $bookingCreateDto)) {
                 $this->bookingService->resetParticipantAssignments($bookingCreateDto);
             }
+
             $bookingCreateDto->currentStep = 2;
             $this->bookingService->saveBookingCreateDto($request, $bookingCreateDto);
 
+            // Clear baseline snapshot when moving to step 2
+            $this->bookingService->clearBaselineSnapshot($request);
+
             return $this->redirectToRoute('app_booking_create_step_2');
         }