A Series checkbox under When opens a panel for the schedule:
weekly on chosen weekdays, monthly by date, or monthly by weekday
position, every N weeks or months, with meeting times and an
optional meeting count. starts_on anchors the schedule and ends_on
bounds it, so effective_status needs no change.
Occurrences are derived, not stored. src/lib/eventSeries.ts builds
the schedule label shown on cards and the event page, and the
upcoming dates listed on the event page.
Migration 016 adds the columns; the CRUD engine gains a time type.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
