- dialog "添加插件":
  - heading "添加插件" [level=2]
  - button "关闭"
  - textbox "插件包名":
    - /placeholder: 例如 dsh-plugin-whale-pet
  - button "插件安装引导和示例"
  - button "安装源 中国大陆镜像源"
  - button "安装" [disabled]