Centralize retained popup panel closing

src/legacy_ui_overlay_services.cpp

@@ -34,6 +34,19 @@ void close_legacy_popup_overlay(Node& node) noexcept
     node.destroy();
 }
 
+void close_legacy_popup_panel(
+    Node& node,
+    const std::function<void(Node*)>& on_close)
+{
+    node.mouse_release();
+    if (node.m_parent) {
+        node.m_parent->remove_child(&node);
+    }
+    if (on_close) {
+        on_close(&node);
+    }
+}
+
 pp::foundation::Status attach_legacy_overlay_node(
     App& app,
     const std::shared_ptr<Node>& node) noexcept