feat: v0.10.0 quieter Matrix, worktrees, usage pace, repo diffs, copy reply, turn timer, compact

- Matrix "needs you": ignore Claude's idle reminder (no red, no post); post
  only when no tab is in view, after 60 s, once per session per 10 min, and
  say what is asked. Closes #50
- devdesk new NAME PROJECT --worktree: own checkout on devdesk/NAME,
  cleaned up on end when clean/merged. Closes #44
- Usage meters: reset time, pace warning; Matrix ping past 90% when away.
  Closes #45
- Repo panel lists changed files; click opens the diff. Closes #46
- Copy Claude's last reply (--last-reply). Closes #47
- Turn timer in chip, title and cards. Closes #48
- Compact button at 80% context when idle. Closes #49

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WHRLCCdXYm41Qx5kNhehaP

web/src/notify.js

@@ -6,13 +6,14 @@ import { FAVICON, FAVICON_BADGE } from './icon.js';
 
 let unread = 0;
 let baseTitle = document.title;
+let statusPrefix = '';
 
 function attentive() {
   return !document.hidden && document.hasFocus();
 }
 
 function render() {
-  document.title = unread ? `(${unread}) ${baseTitle}` : baseTitle;
+  document.title = `${unread ? `(${unread}) ` : ''}${statusPrefix}${baseTitle}`;
   const link = document.getElementById('favicon');
   if (link) link.href = unread ? FAVICON_BADGE : FAVICON;
 }
@@ -22,6 +23,13 @@ export function setBaseTitle(title) {
   render();
 }
 
+// "⏳ 3m · " while Claude works on a turn in this tab's session (devdesk#48).
+export function setStatusPrefix(prefix) {
+  if (prefix === statusPrefix) return;
+  statusPrefix = prefix;
+  render();
+}
+
 export function notificationsState() {
   if (!('Notification' in window)) return 'unsupported';
   return Notification.permission; // granted | denied | default