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The filter-sheet eye was the only hide control on Android and it hard-synced
to the server (sidebar_hidden/enabled) — so a quick, per-device hide leaked to
the web and other devices. Now Android matches iOS' two-tier model:
- Quick-hide (eye toggle) is device-local only (setCalendarHidden → hiddenKeys),
no server call.
- Banish ("permanently hide", new archive action per row) syncs sidebar_hidden
to the server and moves the calendar into Settings; a new "Hidden calendars"
section there re-enables it (server + auto-refetch).
- reconcileCalendarVisibility now drives banishedKeys (not hiddenKeys) from the
server's sidebar_hidden, so the reconcile never overwrites the local quick-hide.
- Filter sheet lists calendars from the unfiltered cache (minus banished), so a
locally hidden calendar still appears and can be toggled back on.
Colours and reminders stay server-synced as before. iOS already had this model
and is unchanged.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>