wip: refactor to cards with individual participant forms

src/Form/Service/ParticipantFieldHandlerRegistry.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace App\Form\Service;
 
+use App\BusProNet\Model\Address;
 use App\BusProNet\Model\Insurance;
 use App\BusProNet\Model\Pickup;
 use App\BusProNet\Model\Service;
@@ -132,13 +133,42 @@ class ParticipantFieldHandlerRegistry
                 }
 
                 // Let each handler decide if it should process this participant's data
-                if ($handler->shouldProcess($participantData, (int) $participantIndex)) {
+                if ($handler->shouldProcess($participantData, $bookingDto->mode, (int) $participantIndex)) {
                     $handler->processField($participantData, $bookingDto, (int) $participantIndex);
                 }
             }
         }
     }
 
+    /**
+     * Processes field handlers for a single participant.
+     *
+     * This method is used by the card-based booking flows where participants are
+     * edited individually. Unlike processFields() which processes all participants,
+     * this method applies all handlers to only the specified participant.
+     *
+     * Handlers are executed in dependency order to ensure proper data consistency.
+     *
+     * @param array<string, mixed> $participantData Submitted data for one participant
+     * @param BookingDto  $bookingDto      The booking DTO to update
+     * @param int         $participantIndex Index of participant to process
+     */
+    public function processFieldsForParticipant(array $participantData, BookingDto $bookingDto, int $participantIndex): void
+    {
+        // Get handlers sorted by dependency order (uses cache if available)
+        $sortedHandlerNames = $this->getSortedHandlers();
+
+        // Apply each handler to the specified participant
+        foreach ($sortedHandlerNames as $handlerName) {
+            $handler = $this->handlers[$handlerName];
+
+            // Let each handler decide if it should process this participant's data
+            if ($handler->shouldProcess($participantData, $bookingDto->mode, $participantIndex)) {
+                $handler->processField($participantData, $bookingDto, $participantIndex);
+            }
+        }
+    }
+
     /**
      * Returns handler names sorted by dependency order using cached results when possible.
      *
@@ -376,7 +406,7 @@ class ParticipantFieldHandlerRegistry
         }
 
         // Handle Address objects -> convert to array of properties
-        if ($value instanceof \App\BusProNet\Model\Address) {
+        if ($value instanceof Address) {
             return [
                 'street' => $value->street,
                 'postCode' => $value->postCode,