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/index.template.html

@@ -28,7 +28,7 @@
     </div>
     <div class="dd-session">
       <button type="button" class="dd-session-chip" id="session-chip" data-state="" aria-haspopup="menu" aria-expanded="false" title="Switch session">
-        <span class="dd-state-dot" aria-hidden="true"></span><span class="dd-session-label" id="session-name">—</span><span class="dd-caret" aria-hidden="true">▾</span>
+        <span class="dd-state-dot" aria-hidden="true"></span><span class="dd-session-label" id="session-name">—</span><span class="dd-turn-timer" id="turn-timer" hidden></span><span class="dd-caret" aria-hidden="true">▾</span>
       </button>
       <span class="dd-pane-title" id="pane-title"></span>
       <div class="dd-menu dd-switcher" id="switcher" role="menu" hidden></div>
@@ -131,6 +131,7 @@
                  aria-label="New session name" spellcheck="false">
           <select class="lt-select" id="project-select" aria-label="Start the new session in a project folder (optional)"></select>
           <button type="submit" class="lt-btn lt-btn-primary lt-btn-sm">Open</button>
+          <label class="dd-check" id="new-session-worktree-label" hidden title="A separate checkout on branch devdesk/NAME, so this Claude never edits the same files as another session"><input type="checkbox" id="new-session-worktree"> own git worktree</label>
         </form>
         <ul class="dd-session-list" id="sessions-list"></ul>
         <span class="dd-muted dd-status" id="sessions-status" role="status"></span>
@@ -155,6 +156,7 @@
           <span class="lt-kv-key">CI · HEAD</span><span class="lt-kv-val"><span class="lt-status" data-field="ci">—</span></span>
           <span class="lt-kv-key">Open PRs</span><span class="lt-kv-val" data-field="prs">—</span>
         </div>
+        <ul class="dd-repo-changes" hidden></ul>
         <p class="dd-muted dd-repo-note"></p>
         <button type="button" class="lt-btn lt-btn-sm dd-ask dd-fix-ci" hidden>Ask Claude to fix CI</button>
       </div>