Kiosk: how to handle multiple late checkout

This update enables the system to calculate the price difference between a previously paid late checkout and a later checkout option selected in the Kiosk.For example: if a guest has already paid €5 for a 12:00 checkout and selects a 15:00 checkout, the system will refer to the Late Departure configuration to determine the amount to be charged for the additional 3 hours.Please note: This is a configuration-only update — the actual implementation of this logic in the Kiosk is not yet available.