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Keep README.zh-CN.md and README.en.md consistent when updating project docs.

Use Semi.WpfUi custom layout controls when building or migrating WPF demo pages and control examples in this repository. Apply when editing XAML under demo/Semi.WpfUi.Demo or composing layouts for Semi.WpfUi controls, especially where WPF Margin is being used only to create spacing between siblings.