feat: automatic unselection of discounted transportation

config/services.yaml

@@ -71,6 +71,7 @@ services:
     # Insurance Field Handlers with dependencies
     App\Form\Service\ParticipantInsuranceFieldHandler: ~
     App\Form\Service\ParticipantBulkInsuranceFieldHandler: ~
+    App\Form\Service\ParticipantTransportationDiscountReplacementFieldHandler: ~
 
     # Participant Field Handler Registry - most handlers instantiate dependencies directly, some use services
     App\Form\Service\ParticipantFieldHandlerRegistry:
@@ -92,5 +93,6 @@ services:
                 - 'App\Form\Service\ParticipantRentalInsuranceFieldHandler'
                 - 'App\Form\Service\ParticipantLicensePlateFieldHandler'
                 # Complex handlers with dependencies - use service references
+                - '@App\Form\Service\ParticipantTransportationDiscountReplacementFieldHandler'
                 - '@App\Form\Service\ParticipantBulkInsuranceFieldHandler'
                 - '@App\Form\Service\ParticipantInsuranceFieldHandler'