fix: exclude cancelled participants' services from price breakdown

src/Service/BookingPricingAssembler.php

@@ -63,7 +63,8 @@ class BookingPricingAssembler
     /**
      * Calculates pricing for all selected services across all participants, grouped by subtype.
      *
-     * Only includes services from eligible participants (those with available skipasses for their age).
+     * Only includes services from billed participants: not cancelled, and eligible (those with available
+     * skipasses for their age).
      *
      * @return array<int, array<string, mixed>>
      */
@@ -78,7 +79,7 @@ class BookingPricingAssembler
         $serviceAggregation = [];
 
         foreach ($participants as $participantIndex => $participant) {
-            if (false === $this->participantEligibilityChecker->isParticipantEligible($bookingDto, $participantIndex)) {
+            if (false === $this->isParticipantBilled($bookingDto, $participantIndex, $participant)) {
                 continue;
             }
 
@@ -142,7 +143,7 @@ class BookingPricingAssembler
         $parkingParticipants = 0;
 
         foreach ($participants as $participantIndex => $participant) {
-            if (false === $this->participantEligibilityChecker->isParticipantEligible($bookingDto, $participantIndex)) {
+            if (false === $this->isParticipantBilled($bookingDto, $participantIndex, $participant)) {
                 continue;
             }
 
@@ -306,6 +307,18 @@ class BookingPricingAssembler
         return $groupedServices;
     }
 
+    /**
+     * Whether the participant's services count towards the breakdown.
+     *
+     * A cancelled participant is billed only through BusPro's Stornokosten surcharge. Their services
+     * are never sent back to BusPro, so counting them would put the breakdown above BusPro's total.
+     */
+    private function isParticipantBilled(BookingDto $bookingDto, int $participantIndex, ParticipantDto $participant): bool
+    {
+        return false === $participant->isCanceled()
+            && true === $this->participantEligibilityChecker->isParticipantEligible($bookingDto, $participantIndex);
+    }
+
     private function getGroupNameForSubtype(string $subType): string
     {
         if (true === in_array($subType, Constants::TOKEN_RENTALS, true)) {