Equal rights for all calendar types: the sidebar remove button is now a uniform
"hide" (eye) for every calendar instead of delete-for-some / nothing-for-shared.
- Owned local (incl. birthday) and iCal now hide via the server sidebar_hidden
flag (delete stays available in Settings' calendar table).
- Calendars shared with me get a per-device sidebar hide (they can't carry a
server flag); their events are filtered out while hidden, and the Settings
calendar table's "shared with me" rows gain an un-hide eye toggle.
- External caldav/google/ha unchanged.
Group calendars intentionally left as-is for now.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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