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>

tasks.js

@@ -187,4 +187,6 @@ async function allTasks() {
   return out;
 }
 
-module.exports = { handle, parseTodos, allTasks, nextDue, stepDate };
+/** Open tasks on the shared Family list, soonest first, for the family board. */
+const familyOpen = () => { const t = readJ(famFile(), { tasks: [] }).tasks || []; return t.filter(x => !x.done && !x.parent).sort((a, b) => (a.due || '9999').localeCompare(b.due || '9999') || a.title.localeCompare(b.title)).slice(0, 8).map(x => ({ id: x.id, title: x.title, due: x.due || '' })); };
+module.exports = { familyOpen, handle, parseTodos, allTasks, nextDue, stepDate };