The calendar shows real rates for the next 30 nights #75

Problem

The calendar screen and the calendar API are built separately. Nothing checks that the calendar shows real rates from production.

Goal

The calendar loads the next 30 nights from one API call and shows, for each night, the recommended rate, the change since the last update, and any events.

Scope

• Connect the calendar screen to the calendar API.
• Remove all placeholder prices.
• Handle the case where the hotel has no trained model yet.

Acceptance criteria

• The calendar on production shows 30 nights from the API, with no placeholder numbers.
• Each night shows its change since the previous update.
• Nights with events show the event names.
• Where the manager has set their own rate, that rate is shown.
• With no trained model, the calendar shows a clear message instead of an error.