feat: automatically assign rooms only for unique room type selection

src/Controller/Booking/Create/Step2Controller.php

@@ -254,6 +254,10 @@ class Step2Controller extends AbstractController
 
     /**
      * Automatically assigns participants to rooms if they don't have room assignments yet.
+     *
+     * Note: Auto-assignment only occurs when exactly one room type is selected.
+     * With multiple room types, users must manually select rooms to avoid UX issues
+     * with having to unselect preassigned rooms in individual participant forms.
      */
     private function autoAssignRoomsIfNeeded(BookingDto $bookingCreateDto): void
     {
@@ -270,5 +274,4 @@ class Step2Controller extends AbstractController
             $this->roomAssignmentService->assignParticipantsToRooms($bookingCreateDto);
         }
     }
-
 }