fix: use --webpack

Author: ken-matsui

next-env.d.ts

@@ -1,5 +1,6 @@
 /// <reference types="next" />
 /// <reference types="next/image-types/global" />
+import "./.next/types/routes.d.ts";
 
 // NOTE: This file should not be edited
 // see https://nextjs.org/docs/app/api-reference/config/typescript for more information.

package.json

@@ -9,7 +9,7 @@
     "scripts": {
         "dev": "next dev",
         "prebuild": "yarn generate",
-        "build": "next build",
+        "build": "next build --webpack",
         "postbuild": "next-sitemap",
         "start": "next start",
         "lint": "biome check .",