fix(ui): attach settings menu keydown synchronously

Caught by Copilot on PR #514.  openSettingsMenu sets _settingsMenu
synchronously, but the menu's keydown handler was registered inside
setTimeout(0).  The previous-commit guard in the global keydown
handler returns early when _settingsMenu is set (so dashboard isn't
hidden by Escape over the menu), which created a window where
Escape had no handler at all — the global skipped, the menu's own
listener wasn't ready yet, and the menu got stuck open until the
next interaction.

Attach keydown synchronously; keep mousedown + initial focus in
setTimeout (mousedown to avoid the opening click triggering its own
outside-click close, focus because the menu DOM needs a tick to
settle layout).

turnstone/ui/static/app.js

@@ -6090,14 +6090,22 @@ function openSettingsMenu(triggerEl) {
     }
   };
 
-  // Defer listener wiring + focus so the click that opened the menu
-  // doesn't immediately trigger the mousedown-close path.
+  // Attach the keydown listener synchronously so an Escape press
+  // queued behind the opening click isn't silently dropped: the
+  // global keydown handler at the bottom of this file returns early
+  // when _settingsMenu is set (the dashboard-Escape-wipes-composer
+  // guard), so without a synchronous menu-side listener there's a
+  // brief window where Escape has no handler at all.  Mousedown +
+  // initial focus stay deferred — mousedown to avoid the click that
+  // opened the menu firing its own outside-click close, initial
+  // focus because the menu DOM needs a tick to settle layout before
+  // we call focus() on its first item.
+  document.addEventListener("keydown", _settingsMenuCloseHandler);
   var activeMenu = menu;
   var closeHandler = _settingsMenuCloseHandler;
   setTimeout(function () {
     if (_settingsMenu !== activeMenu || !closeHandler) return;
     document.addEventListener("mousedown", closeHandler);
-    document.addEventListener("keydown", closeHandler);
     var first = activeMenu.querySelector(".ws-tab-dropdown-item");
     if (first) first.focus();
   }, 0);