refactor(new_editor): centralize window lifecycle ownership

new_editor/app/Platform/Win32/EditorWindowManager.h

@@ -27,6 +27,7 @@ namespace XCEngine::UI::Editor::App {
 class EditorContext;
 class EditorWindow;
 class EditorWindowHostRuntime;
+class EditorWindowLifecycleCoordinator;
 class EditorWindowWorkspaceCoordinator;
 struct EditorWindowPanelTransferRequest;
 struct EditorWindowFrameTransferRequests;
@@ -89,6 +90,7 @@ public:
 
 private:
     std::unique_ptr<EditorWindowHostRuntime> m_hostRuntime = {};
+    std::unique_ptr<EditorWindowLifecycleCoordinator> m_lifecycleCoordinator = {};
     std::unique_ptr<EditorWindowWorkspaceCoordinator> m_workspaceCoordinator = {};
 };