[Feature Request] Uneasy day

[tategotoazarasi]

Is your feature request related to a problem? Please describe.
I'm always frustrated when public holidays or specific dates cause irregular study patterns. The current easy day feature is useful, but it does not accommodate situations where regular weekends are moved to other dates to form continuous holidays.

Describe the solution you'd like
I would like the addition of an "uneasy day" feature. This feature should allow users to set specific dates as hard days to override the easy day settings. This way, users can adapt their study schedules to public holidays and other irregularities in their weekly schedules.

Describe alternatives you've considered
An alternative solution could be to manually adjust the review dates before such holidays, but this is less efficient and could lead to inconsistent study patterns.

Additional context
This feature is particularly useful for countries that practice "adjusted holidays," where weekends are moved to adjacent public holidays, forming continuous breaks.

[L-M-Sherlock]

I recommend using Advance Cards in uneasy day.