Collect guests' expected arrival time in guest portal

It would be extremely helpful to have a fillable field in the rental agreement where guests can enter their expected arrival or check-in time, and have this information automatically synced to the reservation timeline in Hospitable.

This would allow hosts and cleaning teams to better plan turnovers, know how much time they have to prepare the apartment, and reduce last-minute stress and coordination issues. For short-term rentals, real arrival time is often more operationally important than the official check-in window, so having this data directly in the reservation view would greatly improve workflow efficiency.