forked from firka/firka
70213e376c
Add robust date parsing and simplify lesson selection logic. Introduces ISO8601 formatters (with and without fractional seconds) and updates parseNextSchoolDayDate to try both variants, plus existing yyyy-MM-dd fallback. Adds LessonCandidate, startOfDay and nextSchoolDay helpers and builds a sorted candidate list (today, tomorrow, next school day) to pick the appropriate lesson set and correctly set isNextDay/isNextSchoolDay flags. Cleans up previous branching-heavy logic and improves handling of edge cases (lessons finished, next-school-day resolution).
