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/Features/Project/ProjectPanel.cpp

@@ -317,6 +317,10 @@ void ProjectPanel::Initialize(const std::filesystem::path& repoRoot) {
 }
 
 void ProjectPanel::SetProjectRuntime(EditorProjectRuntime* projectRuntime) {
+    if (m_projectRuntime == projectRuntime) {
+        return;
+    }
+
     m_projectRuntime = projectRuntime;
     if (m_projectRuntime != nullptr && m_icons != nullptr) {
         m_projectRuntime->SetFolderIcon(ResolveFolderIcon(m_icons));