Narrow retained UI overlay lifetime debt

src/node_popup_menu.h

@@ -5,6 +5,7 @@ class NodePopupMenu : public Node
 {
 public:
     std::function<void(Node* target, int index)> on_select;
+    void close_popup() noexcept;
     virtual Node* clone_instantiate() const override;
     virtual void init() override;
     virtual kEventResult handle_event(Event* e) override;