chore: fix phpstan errors

src/Service/BookingSessionManager.php

@@ -5,6 +5,8 @@ declare(strict_types=1);
 namespace App\Service;
 
 use App\Exception\BookingSessionNotFoundException;
+use App\Exception\HotelNotInTravelException;
+use App\Exception\TravelNotFoundException;
 use App\Form\Model\BookingDto;
 use Symfony\Component\HttpFoundation\Request;
 
@@ -32,6 +34,8 @@ class BookingSessionManager
      * Retrieves the booking creation DTO from the session.
      *
      * @throws BookingSessionNotFoundException
+     * @throws TravelNotFoundException
+     * @throws HotelNotInTravelException
      */
     public function getOrCreateBookingCreateDto(Request $request): BookingDto
     {
@@ -46,6 +50,8 @@ class BookingSessionManager
 
     /**
      * Gets or creates the baseline room selection snapshot for change detection.
+     *
+     * @return array<int, array{int, int}>
      */
     public function getOrCreateBaselineSnapshot(Request $request, BookingDto $bookingCreateDto): array
     {