feat: improved promotional and purchase vouchers

src/Controller/Booking/Traits/ParticipantCardFlowTrait.php

@@ -76,6 +76,34 @@ trait ParticipantCardFlowTrait
         return $this->createForm(BookingParticipantType::class, $wrapper, $formOptions);
     }
 
+    /**
+     * Collects notifications from all participants and clears them from DTOs.
+     *
+     * This is important for scenarios where field handlers add notifications
+     * during form processing (e.g., voucher validation, auto-unassignment).
+     * Notifications from ALL participants are collected, not just the current one,
+     * because cross-participant logic may add notifications to multiple participants.
+     *
+     * Note: ParticipantDto stores notifications with MD5 keys to prevent duplicates,
+     * but the JavaScript toast controller expects a simple indexed array. We use
+     * array_values() to convert the associative array to an indexed array.
+     *
+     * @return array<array{type: string, message: string}> Array of notification messages
+     */
+    private function collectAndClearNotifications(BookingDto $bookingDto): array
+    {
+        $notifications = [];
+        foreach ($bookingDto->participants as $participant) {
+            if (false === empty($participant->notifications)) {
+                $notifications = array_merge($notifications, $participant->notifications);
+                $participant->notifications = [];
+            }
+        }
+
+        // Convert MD5-keyed associative array to simple indexed array
+        return array_values($notifications);
+    }
+
     /**
      * Process single participant form refresh.
      *
@@ -95,16 +123,8 @@ trait ParticipantCardFlowTrait
 
         $form->handleRequest($request);
 
-        // Collect notifications from ALL participants (not just current one)
-        // This is important for auto-unassignment scenarios where other participants
-        // may receive notifications when the current participant takes an action
-        $notifications = [];
-        foreach ($bookingDto->participants as $participant) {
-            if (false === empty($participant->notifications)) {
-                $notifications = array_merge($notifications, $participant->notifications);
-                $participant->notifications = [];
-            }
-        }
+        // Collect notifications from field handlers
+        $notifications = $this->collectAndClearNotifications($bookingDto);
 
         // Save updated booking data to session (after collecting & clearing notifications)
         $this->bookingService->saveBookingDto($request, $bookingDto, $bookingDto->getMode());