feat: always load fresh api data when starting to edit booking

src/BusProNet/DataProcessor/BookingDataProcessor.php

@@ -233,7 +233,8 @@ class BookingDataProcessor
             $participant->transportationInbound = $travel->transportationServices[$participant->transportationInbound->id];
         }
 
-        // Enrich pickup
+        // Enrich pickup (only outbound - API limitation: pickups are only supported when
+        // outbound transportation is bus; inbound-only bus bookings cannot have pickups)
         if (null !== $participant->pickup && isset($travel->pickupsOutbound[$participant->pickup->id])) {
             $participant->pickup = $travel->pickupsOutbound[$participant->pickup->id];
         }

src/BusProNet/Model/Booking.php

@@ -136,7 +136,8 @@ class Booking
      * Retrieves pickup service for a specific participant.
      *
      * Finds the pickup service assigned to the specified participant
-     * from the outbound pickup services.
+     * from the outbound pickup services. The API only supports pickups
+     * when outbound transportation is bus.
      *
      * @param int $participantIndex The participant index to search for
      *

src/Controller/Booking/Edit/IndexController.php

@@ -59,6 +59,22 @@ class IndexController extends AbstractController
     ) {
     }
 
+    /**
+     * Entry point for editing a booking from the booking list.
+     *
+     * Clears any existing session data and API cache to ensure fresh data
+     * is loaded, then redirects to the main edit page.
+     */
+    #[Route('/bookings/{id}/edit/start', name: 'app_booking_edit_start', requirements: ['id' => '\d+'])]
+    #[IsGranted('ROLE_USER')]
+    public function start(int $id, Request $request): Response
+    {
+        $this->bookingService->clearBookingDto($request, BookingDto::MODE_EDIT);
+        $this->dataLoader->invalidateBookingCache($id);
+
+        return $this->redirectToRoute('app_booking_edit', ['id' => $id]);
+    }
+
     /**
      * Display participant cards overview.
      */

src/Service/BookingEditDataLoaderService.php

@@ -54,11 +54,14 @@ class BookingEditDataLoaderService
     }
 
     /**
-     * Loads booking data from session or initializes from API on first load.
+     * Loads booking data from session or initializes from API.
      *
-     * Validates that any cached session data matches the requested booking ID.
-     * If a different booking is in session, it is cleared and fresh data is loaded.
-     * If a draft exists for this user and booking, it is automatically applied.
+     * Uses session data if available and valid (same booking ID). This preserves
+     * participant edits between form submissions within the same edit session.
+     *
+     * If no session data exists, loads fresh data from API. If a draft exists,
+     * it is automatically applied on top of the fresh API data to restore
+     * pending user edits.
      *
      * @param Request $request   The HTTP request
      * @param int     $bookingId The booking ID to load