🐛 BUG:When building on Cloudflare Pages, I have set the environment variable NODE_VERSION=22.14.0, but it doesn't take effect. The logs still indicate that the build environment is fixed at Node.js version 18.17.1, causing the build to fail.

### Which Cloudflare product(s) does this pertain to?

Pages

### What versions are you using?

C3

### What operating system and version are you using?

Windows 11

### Please provide a link to a minimal reproduction

_No response_

### Describe the Bug

When building on Cloudflare Pages, I have set the environment variable NODE_VERSION=22.14.0, but it doesn't take effect. The logs still indicate that the build environment is fixed at Node.js version 18.17.1, causing the build to fail.

3:23:38.403 | You are using Node.js 18.17.1. For Next.js, Node.js version "^18.18.0 \|\| ^19.8.0 \|\| >= 20.0.0" is required.
-- | --
13:23:38.423 | Failed: Error while executing user command. Exited with error code: 1
13:23:38.434 | Failed: build command exited with code: 1
13:23:39.680 | Failed: error occurred while running build command

### Please provide any relevant error logs


リポジトリのファイルもテストも指定されていません。まず、Pages のビルド設定と C3 のセットアップをビルドログと比較し、NODE_VERSION=22.14.0 が無視され、Next.js のビルドに Node.js 18.17.1 が使われる理由に焦点を当ててください。設定されたサポート対象の Node.js バージョンが使用されるか、制限と必要な設定が文書化されれば完了です。

索引モデルが issue の本文から書いたものです。