feat: load availability data once per booking session

src/Service/BookingService.php

@@ -236,7 +236,8 @@ class BookingService
         }
 
         // Fetch and patch availability data (includes allowedBookingStatus from API)
-        $availabilities = $this->travelDataService->getAvailabilityData($dateId);
+        // Using cached: true populates the cache for subsequent participant form loads
+        $availabilities = $this->travelDataService->getAvailabilityData($dateId, cached: true);
         if (null !== $availabilities) {
             $this->travelDataService->patchAvailabilities($travelData, $availabilities);
         }