message: fix: export Displayable for type annotation compatibility
diff: @@ -23,6 +23,7 @@ export {
  ElementProps
  } from './Element';
  +export {default as Displayable, DisplayableProps} from './graphic/Displayable';
  export {default as Group, GroupProps} from './graphic/Group';
  export {default as Path, PathStyleProps, PathProps, PathStatePropNames, PathState} from './graphic/Path';
  export {default as Image, ImageStyleProps, ImageProps, ImageState} from './graphic/Image';
  