feat: update filename formatting of booking confirmation pdf

src/Service/AccommodationBookingPdfGenerator.php

@@ -11,7 +11,6 @@ use Dompdf\Options;
 use Symfony\Component\DependencyInjection\Attribute\Autowire;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\ResponseHeaderBag;
-use Symfony\Component\String\Slugger\AsciiSlugger;
 use Twig\Environment;
 
 /**
@@ -81,10 +80,6 @@ class AccommodationBookingPdfGenerator
         return $response;
     }
 
-    /**
-     * Named after arrival date and group rather than the entity id, which is a local
-     * detail with no counterpart in BusPro and would read as a booking number.
-     */
     /**
      * @throws \RuntimeException when the booking carries no price information
      */
@@ -95,14 +90,13 @@ class AccommodationBookingPdfGenerator
 
     private function buildFilename(AccommodationBooking $booking): string
     {
-        $groupName = (new AsciiSlugger('de'))->slug((string) $booking->getGroupName())->lower()->toString();
+        $parts = array_filter([
+            $booking->getDateFrom()?->format('Y-m-d'),
+            $booking->getAccommodation()?->getCalendarCode(),
+            'Buchung',
+        ]);
 
-        return sprintf(
-            '%s-%s%s.pdf',
-            mb_strtolower($booking->recordLabel()),
-            $booking->getDateFrom()?->format('Y-m-d') ?? 'ohne-datum',
-            '' !== $groupName ? '-'.$groupName : ''
-        );
+        return implode(' ', $parts).'.pdf';
     }
 
     private function logoDataUri(): string