Merge pull request #519 from aakhter/pr/grouped-rail-tree

feat(tabs): full-row activation and tree semantics for the grouped rail

src/web/public/webview-tabs.js

@@ -358,6 +358,7 @@ Object.assign(CodemanApp.prototype, {
       // A web tab is active, so no session tab may also look active.
       for (const tab of container.querySelectorAll('.session-tab[data-id]')) tab.classList.remove('active');
     }
+    this._syncTabTreeSelection?.(container);
   },
 
   // ── Opening / closing ─────────────────────────────────────────────────────