refactor(new_editor/app): reorganize host structure and add smoke test

new_editor/app/Composition/EditorShellRuntimeSupport.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include "Composition/EditorShellRuntime.h"
+
+#include <XCEditor/Shell/UIEditorShellCompose.h>
+
+namespace XCEngine::UI::Editor::App::RuntimeSupport {
+
+void ApplyViewportFramesToShellFrame(
+    UIEditorShellInteractionFrame& shellFrame,
+    ViewportHostService& viewportHostService);
+
+std::vector<::XCEngine::UI::UIInputEvent> FilterShellInputEventsForHostedContentCapture(
+    const std::vector<::XCEngine::UI::UIInputEvent>& inputEvents);
+
+bool ShouldHostedContentYieldPointerStream(
+    const UIEditorShellInteractionFrame& shellFrame,
+    bool shellInteractiveCaptureActive);
+
+std::vector<::XCEngine::UI::UIInputEvent> FilterHostedContentInputEventsForShellOwnership(
+    const std::vector<::XCEngine::UI::UIInputEvent>& inputEvents,
+    bool shellOwnsPointerStream);
+
+UIEditorShellComposeModel BuildShellComposeModelFromFrame(
+    const UIEditorShellInteractionFrame& frame);
+
+void AppendShellPopups(
+    ::XCEngine::UI::UIDrawList& drawList,
+    const UIEditorShellInteractionFrame& frame,
+    const UIEditorShellInteractionPalette& palette,
+    const UIEditorShellInteractionMetrics& metrics);
+
+} // namespace XCEngine::UI::Editor::App::RuntimeSupport