fix(maestro): tool icon left of diff stat on sidebar meta line

Meta line fragment order was command last, after the blocked-work diff
stat, so the tool icon sat right of the diff count instead of left.
Reorder to duration/detail/command/diff-stat in both web and TUI
sidebars per docs/SIDEBAR.md, and update the contract doc + TUI tests
to match.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

web/src/catalog.ts

@@ -90,9 +90,9 @@ function metaLine(s: Session, now: number): string {
     s.activity_detail
       ? `<span class="activity-detail">${escapeHtml(s.activity_detail)}</span>`
       : "",
+    commandFragment(s.command),
     blockers ? blockedFragment(blockers) : "",
     dead ? `<span class="card-flag">exited</span>` : "",
-    commandFragment(s.command),
   ];
   return `<span class="card-line2" data-activity="${slug}">${fragments.join("")}</span>`;
 }