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

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