chore: fix phpstan errors

src/BusProNet/XmlLoader/TravelLoader.php

@@ -51,7 +51,7 @@ class TravelLoader extends AbstractLoader
      * including ID, code, label, dates, and associated hotels. The mapping is
      * cached for 3 hours to improve performance.
      *
-     * @return array<int, array> Mapping of travel IDs to their metadata and file paths
+     * @return array<int, array<string, mixed>> Mapping of travel IDs to their metadata and file paths
      */
     public function generateFilesMap(): array
     {
@@ -74,7 +74,7 @@ class TravelLoader extends AbstractLoader
                     $travelDataNodes = $crawler->filterXPath('//reisen/reise/termin');
 
                     $travelDataNodes->each(function (Crawler $node) use (&$mapping, $hotels, $file) {
-                        $travelId = $node->attr('idbuspro');
+                        $travelId = (int) $node->attr('idbuspro');
 
                         $mapping[$travelId] = [
                             'id' => $travelId,
@@ -173,6 +173,7 @@ class TravelLoader extends AbstractLoader
      *
      * @throws TravelNotFoundException   When travel ID is not found
      * @throws HotelNotInTravelException When hotel ID exists but not for this travel
+     * @throws \RuntimeException         When cached mapping generation fails unexpectedly
      */
     public function loadById(int $dateId, ?int $hotelId = null, ?string $filename = null): Travel
     {