Settings: a Family tab gathering chat, PIN, chores and rewards, family board people and shared screens

- New Family tab in Settings; each row opens the existing sheet
- Admin switches for who appears on the family board
- Shared-screen controls moved here from Security
- Chore manager can be reopened from Settings after a save

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

public/index.html

@@ -103,6 +103,7 @@
 <script src="/keys.js"></script>
 <script src="/inbox-view.js"></script>
 <script src="/device-ui.js"></script>
+<script src="/settings-family.js"></script>
 <script src="/boot.js"></script>
 <script src="/shell.js"></script>
 </body>