fix: revert to stable Next.js 15 and add @swc/helpers to dependencies for Docker standalone runtime

apps/web/next-env.d.ts

@@ -1,7 +1,6 @@
 /// <reference types="next" />
 /// <reference types="next/image-types/global" />
-import "./.next/types/routes.d.ts";
-import "./.next/types/root-params.d.ts";
+/// <reference path="./.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.

apps/web/package.json

@@ -12,7 +12,8 @@
   "dependencies": {
     "@menulio/shared": "workspace:*",
     "@supabase/supabase-js": "^2.45.4",
-    "next": "^16.3.1",
+    "@swc/helpers": "^0.5.15",
+    "next": "^15.2.1",
     "react": "^18.3.1",
     "react-dom": "^18.3.1"
   },