wip: email uniqueness validation

src/Controller/Booking/Traits/ParticipantCardFlowTrait.php

@@ -6,6 +6,7 @@ namespace App\Controller\Booking\Traits;
 
 use App\Form\BookingParticipantType;
 use App\Form\Model\BookingDto;
+use App\Form\Model\ParticipantEditDto;
 use Symfony\Component\Form\FormInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
@@ -61,12 +62,18 @@ trait ParticipantCardFlowTrait
             throw new \InvalidArgumentException(sprintf('Participant at index %d does not exist', $index));
         }
 
+        // Create wrapper DTO for email uniqueness validation
+        $wrapper = new ParticipantEditDto(
+            participant: $participant,
+            bookingContext: $bookingDto,
+        );
+
         // Merge default options with provided options
         $formOptions = array_merge([
             'booking_context' => $bookingDto,
         ], $options);
 
-        return $this->createForm(BookingParticipantType::class, $participant, $formOptions);
+        return $this->createForm(BookingParticipantType::class, $wrapper, $formOptions);
     }
 
     /**