- Add a per-user birthday_calendars table (color, cascade-deletes with
the user) and GetBirthdayCalendarColor/SetBirthdayCalendarColor in
internal/db, plus a reservedCalendarNames guard ("birthdays") in
CreateCalendarWithColor so no real calendar can collide with the
synthetic one, whether created via the web UI, nidusctl, or CalDAV
MKCALENDAR.
- Add a "Birthdays" virtual resource card to the dashboard (color
picker only, no delete/share controls) backed by a new
ResourceCard.Virtual flag and POST /web/resources/birthdays/color
handler.
- Extract the birthday-parsing/generation logic shared by the web
calendar view and CalDAV into internal/birthdays (ParseBirthday,
Collect, OccurrenceDate, Summary) instead of duplicating it.
- Expose the Birthdays calendar over real CalDAV in
internal/caldav/backend.go + birthdays.go: it's always listed for
every user, generates one VEVENT per (contact, year) for a rolling
window (current year -2..+8) with "🎂 Name (Age)" titles, is
read-only (Put/Delete/DeleteCalendar all return 403), and its
Apple/DAVx5 calendar-color is injected from the same per-user
setting used by the dashboard/web view.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>