refactor(new_editor): tighten app dependency boundaries

new_editor/app/Features/Scene/SceneViewportToolOverlay.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "Scene/SceneToolState.h"
+#include "Host/HostFwd.h"
 
 #include <XCEngine/UI/DrawData.h>
 #include <XCEngine/UI/Types.h>
@@ -9,12 +10,6 @@
 #include <filesystem>
 #include <cstddef>
 
-namespace XCEngine::UI::Editor::Host {
-
-class NativeRenderer;
-
-} // namespace XCEngine::UI::Editor::Host
-
 namespace XCEngine::UI::Editor::App {
 
 inline constexpr std::size_t kSceneViewportToolOverlayInvalidIndex =
@@ -41,8 +36,8 @@ class SceneViewportToolOverlay {
 public:
     bool Initialize(
         const std::filesystem::path& repoRoot,
-        Host::NativeRenderer& renderer);
-    void Shutdown(Host::NativeRenderer& renderer);
+        Host::TextureHost& renderer);
+    void Shutdown(Host::TextureHost& renderer);
     void ResetFrame();
 
     void BuildFrame(