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Calendar rule/grid lines were light gray, which dithers away to near-invisible on the 6-color e-ink palette -- now black. CalDAV accounts (Nextcloud, Fastmail, iCloud, ...) can now be linked alongside the existing single ICS subscription, since one account can expose several calendars. A frame's Calendar tab now lists calendars per person rather than one opt-in per person: your own row shows every calendar you have available with a full add/remove toggle, while other linked users' rows show only calendars they've included, toggleable off (mute) but not on -- only a calendar's owner can add it to a shared frame. FrameCalendar replaces the old single-boolean UserFrame.calendar_included; existing opt-ins are migrated forward.