message: chore: update style classname
diff: @@ -12,7 +12,7 @@ export const defaultLeafIcon = <span style={{ display: 'inline-block', width: 16
  export const defaultLoadingIcon = (
  <svg
  style={{ display: 'inline-block', width: 16 }}
  - className="hi-v4-icon--loading"
  + className="hi-v4-tree--icon-loading"
  viewBox="0 0 18 18"
  width="0.8em"
  height="0.8em"
  