`contains_pointer` reads where the pointer is NOW; a slow frame can
deliver the press on a menu and the move off it in the same pass, and
the gate would then pass with the saved press origin under the menu.
`layer_id_at(press_origin) == resp.layer_id` asks which layer owns the
press itself: the menu's area (or any modal) wins there and the guide
under it stays untouched. The navigator check stays for its own widget.