feat: improved mutability checks for personal data in edit or create mode

src/Controller/Booking/Create/IndexController.php

@@ -106,6 +106,26 @@ class IndexController extends AbstractController
         return $agency->id;
     }
 
+    /**
+     * Cancels the active booking session and returns to the login page.
+     *
+     * This endpoint allows users to exit the booking flow at any time by
+     * clearing the booking session data and redirecting them back to the
+     * regular login screen.
+     */
+    #[Route('/bookings/cancel', name: 'app_booking_cancel')]
+    public function cancel(Request $request): Response
+    {
+        // Clear the booking session
+        $this->bookingService->clearBookingSession($request);
+
+        // Add a flash message to inform the user
+        $this->addFlash('info', 'Buchung abgebrochen.');
+
+        // Redirect to login page
+        return $this->redirectToRoute('app_login');
+    }
+
     /**
      * Displays user-friendly error messages for booking initialization failures.
      *