refactor(new_editor): tighten app dependency boundaries

new_editor/app/Platform/Win32/EditorWindowTransferRequests.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif
+
+#include <windows.h>
+
+#include <optional>
+#include <string>
+
+namespace XCEngine::UI::Editor::App {
+
+struct EditorWindowPanelTransferRequest {
+    std::string nodeId = {};
+    std::string panelId = {};
+    POINT screenPoint = {};
+
+    bool IsValid() const {
+        return !nodeId.empty() && !panelId.empty();
+    }
+};
+
+struct EditorWindowFrameTransferRequests {
+    std::optional<EditorWindowPanelTransferRequest> beginGlobalTabDrag = {};
+    std::optional<EditorWindowPanelTransferRequest> detachPanel = {};
+
+    bool HasPendingRequests() const {
+        return beginGlobalTabDrag.has_value() || detachPanel.has_value();
+    }
+};
+
+} // namespace XCEngine::UI::Editor::App