Description
Description: Add the ability to define and display intercalary days (days that are not assigned to any day of the week) within a calendar. These days should: Appear at a fixed position in the calendar (e.g., between two specific weeks, at the end of a month, or mid-year). Not increment the weekday counter (e.g., if the day before is a “Saturday,” the day after should be “Sunday,” with the intercalary day in between). Support custom naming (e.g., “Mid-Fortnight Festival,” “Lithe,” etc.). Optionally allow event scheduling on them. Example Use Case: In the Hyperborean (FGG - The Lost Lands) calendar, each fortnight is 15 days long: two 7-day weeks separated by a non-weekday festival day. That festival day is not part of any week and should be represented distinctly in the calendar UI without shifting the weekday cycle.