wip: refactor

src/Form/Model/BookingDtoInterface.php

@@ -47,4 +47,11 @@ interface BookingDtoInterface
      * @return ParticipantDto|null The participant DTO or null if not found
      */
     public function getParticipant(int $index): ?ParticipantDto;
+
+    /**
+     * Gets all selected rooms for the booking.
+     *
+     * @return array<int, RoomSelectionDto> Array of selected room DTOs (may be empty for edit DTOs)
+     */
+    public function getSelectedRooms(): array;
 }