fix(app): run menu selections that close the menu on iOS

Selecting an item parked its action in a ref and waited for the Modal's
onDismiss to flush it. MenuOverlay returns null as soon as the menu closes, so
the Modal unmounted and onDismiss never fired: every close-on-select action was
dropped. Creating a terminal from the compact workspace menu did nothing at all.

Wait on a timer instead. The grace period was always about giving UIKit time to
tear the surface down before a native presenter launches, and a callback fired
from inside a subtree being removed is racing its own removal. The sheet had no
flush at all, so it was broken the same way for a different reason.

packages/app/src/components/ui/menu/menu-surface.tsx

@@ -206,7 +206,7 @@ function MenuPopoverSurface({
 
   return (
     <MenuSurfaceContext.Provider value={surfaceValue}>
-      <MenuOverlay visible={menu.open} onClose={handleClose} onDismiss={menu.flushPendingSelect}>
+      <MenuOverlay visible={menu.open} onClose={handleClose}>
         <>
           <AnchoredSurface
             open={menu.open}