Visually grey out dates beyond availability window in calendar

Currently, the calendar does not visually distinguish dates that are beyond the configured availability window (e.g., 60 days). This makes it difficult for hosts to tell at a glance whether the setting is correctly applied.

The request is to have these dates have a light grey background fill—similar to how dates from other months are displayed in a monthly calendar view—rather than the dark grey bar used for manual blocks. This would provide a subtle but clear visual confirmation that the availability window is active.