Clarify 'Blocked Date' warning for minimum stay restrictions

When creating a booking that does not meet the minimum stay requirement for a specific date, the system currently displays a warning stating that the 'Selected date(s) are blocked'.

This is misleading as the date is not actually blocked on the calendar, but simply doesn't meet the stay length requirement. The wording should be updated to clearly distinguish between a calendar block and a minimum stay restriction to avoid user confusion.