Improve Visibility and Accessibility of Upsell Links for Hosts

Currently, the links to send early and late check-in upsells to guests are tucked away in the reservation details/side panel, making them difficult for hosts to find and send quickly. This creates friction for the host and delays the process for the guest.

The request is to make these links more prominent and easier to access directly from the conversation thread or a more intuitive location, streamlining the payment process for both hosts and guests.