wip: refactor to cards with individual participant forms

src/Form/Service/ParticipantTransportationOutboundFieldHandler.php

@@ -32,11 +32,12 @@ class ParticipantTransportationOutboundFieldHandler extends AbstractParticipantF
      * participant DTO is updated with null when no transportation is selected.
      *
      * @param array<string, mixed> $submittedData    The submitted participant form data
+     * @param string               $mode             The booking mode (BookingDto::MODE_CREATE or MODE_EDIT)
      * @param int                  $participantIndex The index of the participant being processed
      *
      * @return bool Always returns true for transportation selection fields
      */
-    public function shouldProcess(array $submittedData, int $participantIndex): bool
+    public function shouldProcess(array $submittedData, string $mode, int $participantIndex): bool
     {
         return true; // Always process to handle deselection cases
     }