feat: unique email addresses of participants unless child, cleanup

addresses #869axbn21

src/Controller/Booking/Edit/IndexController.php

@@ -156,10 +156,13 @@ class IndexController extends AbstractController
             return $this->hxRedirect($request, $this->generateUrl('app_booking_edit', ['id' => $id]));
         }
 
-        // Extract participant indices with validation errors
+        // Extract participant validation errors
         $participantErrors = [];
+        $participantErrorMessages = [];
         if ($form->isSubmitted() && false === $form->isValid()) {
-            $participantErrors = $this->extractParticipantErrorIndices($form);
+            $extractedErrors = $this->extractParticipantValidationErrors($form);
+            $participantErrors = $extractedErrors['errorIndices'];
+            $participantErrorMessages = $extractedErrors['errorMessages'];
         }
 
         // Generate card data for all participants
@@ -189,6 +192,7 @@ class IndexController extends AbstractController
             'isDirty' => $this->fingerprintService->isDirty($bookingDto),
             'hasValidationErrors' => count($participantErrors) > 0,
             'participantErrors' => $participantErrors,
+            'participantErrorMessages' => $participantErrorMessages,
         ];
 
         // If HTMX request, render only blocks to avoid layout duplication