checkpoint(new_editor): native d3d12 ui path

Key node 1: move main-window UI presentation onto the D3D12 render loop with native UI renderer, text system, and texture host.

Key node 2: wire frame timing/FPS display, window runtime, swapchain presentation, and native screenshot capture around the new path.

Key node 3: carry editor shell/workspace/viewport/panel interaction updates needed by the new renderer and detached window flow.

Key node 4: pump async resource loads and scene bridge follow-up needed for scene content visibility in new_editor.

new_editor/app/Bootstrap/Application.cpp

@@ -228,6 +228,7 @@ int Application::Run(HINSTANCE hInstance, int nCmdShow) {
         }
 
         if (m_windowManager != nullptr) {
+            ::XCEngine::Resources::ResourceManager::Get().UpdateAsyncLoads();
             m_windowManager->DestroyClosedWindows();
             if (!m_windowManager->HasWindows()) {
                 break;