WooCommerce Bookings

Issue: when checking availability, the buffer parameters are use to add buffer days without checking if those days are already blocked as buffer days for another booking, resulting in situation where days are incorrectly made as unavailable and are showing as available in the calendar.

Proposed fix: update the logic to check if a day is already blocked as a buffer day before adding it to the buffer_days array and correct the UI logic to reflect the real availability.