fix: properly handle 'veg' services in booking edit flow

src/BusProNet/DataProcessor/BookingDataProcessor.php

@@ -105,6 +105,9 @@ class BookingDataProcessor
             $participantData->board = $booking
                 ->getAdditionalServicesForParticipantByGroup($index, Constants::TOKEN_BOARD);
 
+            $vegServices = $booking->getAdditionalServicesForParticipantByGroup($index, Constants::TOKEN_VEG);
+            $participantData->veg = false === empty($vegServices) ? reset($vegServices) : null;
+
             $participantData->rentals = $booking
                 ->getAdditionalServicesForParticipantByGroup($index, Constants::TOKEN_RENTALS);
 
@@ -211,6 +214,11 @@ class BookingDataProcessor
             }
         }
 
+        // Enrich veg
+        if (null !== $participant->veg && isset($travel->additionalServices[$participant->veg->id])) {
+            $participant->veg = $travel->additionalServices[$participant->veg->id];
+        }
+
         // Enrich rentals
         foreach ($participant->rentals as $key => $rental) {
             if (isset($travel->additionalServices[$rental->id])) {

src/BusProNet/DataProcessor/BookingPayloadBuilder.php

@@ -171,8 +171,8 @@ class BookingPayloadBuilder
                 '@idzimmer' => $room->id,
                 '@kategorie' => $room->category,
                 '@idverpflegung' => $room->boardId,
-                '@anreise' => $room->dateFrom ? $room->dateFrom->format('d.m.Y') : null,
-                '@abreise' => $room->dateTo ? $room->dateTo->format('d.m.Y') : null,
+                '@anreise' => $room->dateFrom?->format('d.m.Y'),
+                '@abreise' => $room->dateTo?->format('d.m.Y'),
                 '@anzahl' => $room->totalCount,
                 '@zuordnung' => implode(',', array_map(fn ($index) => $index + 1, $uniqueMapping)),
             ];

src/BusProNet/DataProcessor/ParticipantServiceProcessor.php

@@ -131,6 +131,11 @@ class ParticipantServiceProcessor
             ...$participant->rentals,
         ];
 
+        // Veg is encoded as an additional service in the edit/update payload.
+        if (null !== $participant->veg) {
+            $services[] = $participant->veg;
+        }
+
         // Add ski pass if selected (single service, not an array)
         if (null !== $participant->skiPass) {
             $services[] = $participant->skiPass;