Extends the Repeats picker's BYDAY support (which deliberately excluded
ordinaled rules) to cover FREQ=MONTHLY with a single ordinaled BYDAY, via
RFC 5545's ByDay(num, weekday) - "the 3rd Thursday of the month" or "the
last Friday", not just a fixed day-of-month.
- CalendarItem.recurrenceByDayOrdinal (1..4, or -1 for "last") pairs with the
existing recurrenceByDay field, reused as a singleton for this mode.
- RecurrenceUtils gets a new walker using TemporalAdjusters.dayOfWeekInMonth,
correctly skipping months where the Nth weekday doesn't exist (RFC 5545:
no occurrence that month, not a rollover) and correctly preserving local
time-of-day across DST boundaries.
- Repeats picker: a 2-item "Monthly on day N" vs "Monthly on the Nth
<weekday>" dropdown, weekday always derived from the current Starts/Due
date rather than picked separately.
Verified live against the real Nextcloud server (created a "3rd Friday"
event, confirmed it round-tripped to the correct RRULE and resolved to the
correct date next month) and cleaned up afterward.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
RomanNum3ral
f3f8d76cda
