広場投稿追加画面の刷新 (#399) (#413)

Reviewed-on: http://git.miteruzo.com/miteruzo/btrc-hub/pulls/413
Co-authored-by: miteruzo <miteruzo@naver.com>
Co-committed-by: miteruzo <miteruzo@naver.com>

frontend/src/lib/api.ts

@@ -8,6 +8,7 @@ import type { AxiosError, AxiosRequestConfig } from 'axios'
 type Opt = {
     params?:        AxiosRequestConfig['params']
     headers?:       Record<string, string>
+    signal?:        AbortSignal
     responseType?:  'blob' }
 
 const client = axios.create ({ baseURL: API_BASE_URL })