fix: allow updating room assignments in edit mode

tests/Form/Model/ParticipantEditDtoTest.php

@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace App\Tests\Form\Model;
 
 use App\BusProNet\Model\Travel;
+use App\BusProNet\XmlLoader\AgencyLoader;
 use App\Form\Model\BookingDto;
 use App\Form\Model\ParticipantDto;
 use App\Form\Model\ParticipantEditDto;
@@ -373,6 +374,46 @@ class ParticipantEditDtoTest extends TestCase
         $this->assertCount(0, $violations5);
     }
 
+    public function testInternalAgencyBookingSkipsEmailUniqueness(): void
+    {
+        $bookingDto = $this->createBookingDtoWithParticipants([
+            $this->createAdultParticipant('[email protected]'),
+            $this->createAdultParticipant('[email protected]'),
+            $this->createAdultParticipant('[email protected]'),
+        ]);
+
+        // Mark as internal agency booking
+        $bookingDto->agencyCode = AgencyLoader::INTERNAL_AGENCY_CODE;
+
+        // Validate second participant (non-applicant adult with duplicate email)
+        $wrapper = new ParticipantEditDto(
+            participant: $bookingDto->participants[1],
+            bookingContext: $bookingDto,
+        );
+
+        $violations = $this->validator->validate($wrapper, null, ['booking_create']);
+
+        $this->assertCount(0, $violations, 'Internal agency bookings should skip email uniqueness validation');
+    }
+
+    public function testNonAgencyBookingStillEnforcesEmailUniqueness(): void
+    {
+        $bookingDto = $this->createBookingDtoWithParticipants([
+            $this->createAdultParticipant('[email protected]'),
+            $this->createAdultParticipant('[email protected]'),
+        ]);
+
+        // Non-agency booking (default agencyCode is null)
+        $wrapper = new ParticipantEditDto(
+            participant: $bookingDto->participants[1],
+            bookingContext: $bookingDto,
+        );
+
+        $violations = $this->validator->validate($wrapper, null, ['booking_create']);
+
+        $this->assertCount(1, $violations, 'Non-agency bookings should still enforce email uniqueness');
+    }
+
     // =========================================
     // Ski Pass Validation Tests (Baby Age Exemption)
     // =========================================