FeedScreen 컴포넌트를 다음과 같이 수정해주세요.

screens/FeedScreen.js

(...)

function FeedScreen() {
  const {
    posts,
    noMorePost,
    refreshing,
    onLoadMore,
    onRefresh,
    removePost,
  } = usePosts();

  useEffect(() => {
    events.addListener('refresh', onRefresh);
    events.addListener('removePost', removePost);
    return () => {
      events.removeListener('refresh', onRefresh);
      events.removeListener('removePost', removePost);
    };
  }, [onRefresh, removePost]);

  (...)