Family devices: shared-screen family board with a who-is-this profile picker

- Admin can make a screen a family device; it opens on a family board
- Name tiles with KID labels; kids tap, others enter a PIN (lockout after 5 wrong tries)
- Name label with Switch user, auto-return to the board after 5 idle minutes
- Short 30-minute sessions on family devices
- Settings section for PIN and turning a device on or off
- Test, README and roadmap updated

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

cal.js

@@ -477,4 +477,9 @@ async function handle(req, res) {
   } catch (e) { json(res, 400, { error: e.message }); }
 }
 
-module.exports = { collectEvents, unfold, parseLine, parseDate, unesc, handle, feed, parseEvents, expand, zonedToUtc, assertPublic, localIcs };
+/** The Family calendar's events in a window, for the family board (no signed-in person needed). */
+function familyEvents(win) {
+  const ics_ = ics.buildCalendar(eventsIn(dirFor(FAM)).map(e => ({ uid: e.uid, fields: e.fields })));
+  return expand(parseEvents(ics_), win).map(e => ({ ...e, cal: 'Family', color: FAMCAL.color }));
+}
+module.exports = { familyEvents, collectEvents, unfold, parseLine, parseDate, unesc, handle, feed, parseEvents, expand, zonedToUtc, assertPublic, localIcs };