Managed special-dates calendars were only recognised by an id cached in
preferences, and were offered as ordinary write targets — so a user could
create an event in 'Birthdays' (which the next sync then deleted), and after
a backup restore wiped the prefs the editor lock silently disappeared.
CalendarSource now carries isManaged, read from the durable CAL_SYNC2 marker
the data layer already stamps, so identity survives a restore. With it:
- the new-event calendar picker excludes managed calendars (no user events
land in a calendar the sync owns);
- the editor lock keys off the marker, not a stored id;
- a managed event's save is forced to the whole series instead of parking in
the scope dialog (a 'this/following' split creates rows the sync reverts);
- the detail sheet hides Delete for managed events (the sync would just
resurrect them — a contact date is removed at its source).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Jean-Luc Makiola
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