feat: implement mutability cutoff for rentals

addresses #869cca42x

tests/Service/BookingEditSubmitGuardServiceTest.php

@@ -12,10 +12,16 @@ use App\BusProNet\Model\Travel;
 use App\Form\Model\BookingDto;
 use App\Form\Model\ParticipantDto;
 use App\Service\BookingEditSubmitGuardService;
+use Carbon\CarbonImmutable;
 use PHPUnit\Framework\TestCase;
 
 class BookingEditSubmitGuardServiceTest extends TestCase
 {
+    protected function tearDown(): void
+    {
+        CarbonImmutable::setTestNow();
+    }
+
     public function testReconcileImmutableCategoriesRestoresLockedServiceData(): void
     {
         $travel = new Travel();
@@ -90,6 +96,43 @@ class BookingEditSubmitGuardServiceTest extends TestCase
         $this->assertSame([99], array_map(static fn (Service $s) => $s->id, $workingParticipant->additionalServices));
     }
 
+    public function testReconcileImmutableCategoriesLocksRentalsFromFourDaysBeforeTravelStart(): void
+    {
+        CarbonImmutable::setTestNow('2026-01-08 12:00:00');
+
+        $travel = new Travel();
+        $travel->dateFrom = new \DateTimeImmutable('2026-01-10 09:00:00');
+        $travel->additionalServicesMutable = true;
+        $travel->transportationServicesMutable = true;
+        $travel->pickupsMutable = true;
+
+        $workingParticipant = new ParticipantDto();
+        $workingParticipant->index = 0;
+        $workingParticipant->rentals = [$this->createService(99)];
+
+        $workingDto = new BookingDto($travel, 1);
+        $workingDto->participants = [$workingParticipant];
+
+        $baselineParticipant = new ParticipantDto();
+        $baselineParticipant->index = 0;
+        $baselineParticipant->rentals = [$this->createService(10)];
+
+        $baselineDto = new BookingDto($travel, 1);
+        $baselineDto->participants = [$baselineParticipant];
+
+        $processor = $this->createMock(BookingDataProcessor::class);
+        $processor->expects($this->once())
+            ->method('createBookingDtoFromBooking')
+            ->willReturn($baselineDto);
+
+        $service = new BookingEditSubmitGuardService($processor);
+
+        $changed = $service->reconcileImmutableCategories($workingDto, new Booking());
+
+        $this->assertTrue($changed);
+        $this->assertSame([10], array_map(static fn (Service $s) => $s->id, $workingParticipant->rentals));
+    }
+
     private function createService(int $id): Service
     {
         $service = new Service();