message: refactor(panel): add external on root element
diff: @@ -38,7 +38,8 @@ export const ShadowPortal = (props: ShadowPortalProps) => {
  if (!$root) {
  $root = document.createElement('div')
  $root.id = id
  - $root.className = `saladict-div ${shadowRootClassName}`
  + $root.className = `saladict-div ${shadowRootClassName ||
  + SALADICT_EXTERNAL}`
  }
  return $root
  }, [shadowRootClassName])
  