The special-dates mirrors were the last unexplained exclusion: writable,
visible, syncing, and still not offered as an event target, because their
events belong to the contact sync and anything authored there is removed on
the next pass. Their rows now say "Filled from your contacts", and the
pickers' footer names that third reason alongside switched-off and
read-only.
Their delete stays where it is rather than disappearing, but is held while
special dates are on: reconcileCalendars recreates a missing mirror for an
enabled type on the very next sync, so the delete would look like it worked
and then quietly undo itself. The button dims, an info card in the editor
says why and points at Settings → Special dates, and turning the feature off
gives the delete back — at which point a leftover mirror really is the
user's to remove.
The lock is derived from the enabled types' stored calendar ids, which is
what the sync itself reconciles against: a mirror whose type is switched off
is already an orphan the next sync would delete anyway, so it stays
deletable by hand.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Jean-Luc Makiola
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