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/sw.js

@@ -1,5 +1,5 @@
 // App-shell cache only; Seafile/API traffic always goes to the network.
-const CACHE = 'hub-v78';
+const CACHE = 'hub-v79';
 const SHARE = 'hub-share'; // files shared into the app from other apps, held until the person picks a folder
 const SHELL = ['/icon.svg', '/manifest.webmanifest', '/icons/icon-192.png', '/icons/apple-touch-icon.png'];