Refine new editor shell host and embedded icons

new_editor/include/XCEditor/Shell/UIEditorMenuBar.h

@@ -30,7 +30,7 @@ struct UIEditorMenuBarMetrics {
     float horizontalInset = 0.0f;
     float verticalInset = 2.0f;
     float buttonGap = 1.0f;
-    float buttonPaddingX = 4.0f;
+    float buttonPaddingX = 7.0f;
     float labelFontSize = 13.0f;
     float estimatedGlyphWidth = 6.5f;
     float labelInsetY = -1.5f;