chore: remove unused file (#5269)

src/hooks/useOnClickOutside.tsx

-import { RefObject, useEffect, useRef } from 'react'
-
-export function useOnClickOutside<T extends HTMLElement>(
-  node: RefObject<T | undefined>,
-  handler: undefined | (() => void)
-) {
-  const handlerRef = useRef<undefined | (() => void)>(handler)
-  useEffect(() => {
-    handlerRef.current = handler
-  }, [handler])
-
-  useEffect(() => {
-    const handleClickOutside = (e: MouseEvent) => {
-      if (node.current?.contains(e.target as Node) ?? false) {
-        return
-      }
-      if (handlerRef.current) handlerRef.current()
-    }
-
-    document.addEventListener('mousedown', handleClickOutside)
-
-    return () => {
-      document.removeEventListener('mousedown', handleClickOutside)
-    }
-  }, [node])
-}