Family Chat (2.0): a built-in messenger for the family, phase 1

- Chat tab: direct chats and groups, text, attachments, replies, reactions, edit and delete, unread counts, search, drafts, mute and archive
- Live delivery over server-sent events; phone push for people who are not in the app (muted chats stay quiet)
- chat.js keeps conversations and files in data/chat; push.notify sends one person a notification
- Roadmap updated: phase 1 done, combined inbox with Signal still to do

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

public/signal-view.js

@@ -29,7 +29,7 @@ function sgChime() {
     o.connect(g); g.connect(sgAC.destination); o.start(t + d); o.stop(t + d + 0.45); });
 }
 function sgBadgeEverywhere() { // Signal chats, unread mail and tasks due: one number on the tab title and the installed app's icon
-  const n = (sg.unread || 0) + (typeof mailUnread === 'number' ? mailUnread : 0) + (typeof taskDue === 'number' ? taskDue : 0);
+  const n = (sg.unread || 0) + (typeof ch === 'object' ? ch.unread || 0 : 0) + (typeof mailUnread === 'number' ? mailUnread : 0) + (typeof taskDue === 'number' ? taskDue : 0);
   document.title = (n ? '(' + (n > 99 ? '99+' : n) + ') ' : '') + 'NE Hub';
   try { if (navigator.setAppBadge) { n ? navigator.setAppBadge(n) : navigator.clearAppBadge(); } } catch {}
 }