feat: tracking integration with GTM and CMP

src/Controller/Booking/Create/Step4Controller.php

@@ -92,8 +92,11 @@ class Step4Controller extends AbstractController
                     );
                 }
 
-                // Success: Store booking number in flash and clear session
+                // Success: Store booking data in flash for conversion tracking
+                $summaryData = $this->summaryDataService->getSummaryData($bookingCreateDto);
                 $this->addFlash('booking_number', $bookingResponse->bookingNumber);
+                $this->addFlash('booking_total', $summaryData->payableAmount);
+                $this->addFlash('booking_travel_name', $bookingCreateDto->travel->label);
                 $this->clearTravelDataCache($bookingCreateDto);
                 $this->bookingService->clearBookingDto($request, BookingDto::MODE_CREATE);