Refine XCEditor docking and DPI rendering

new_editor/include/XCEditor/Foundation/UIEditorTextMeasurement.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <string_view>
+
+namespace XCEngine::UI::Editor {
+
+struct UIEditorTextMeasureRequest {
+    std::string_view text = {};
+    float fontSize = 0.0f;
+};
+
+class UIEditorTextMeasurer {
+public:
+    virtual ~UIEditorTextMeasurer() = default;
+
+    virtual float MeasureTextWidth(const UIEditorTextMeasureRequest& request) const = 0;
+};
+
+} // namespace XCEngine::UI::Editor