Set outputFileTracingRoot to monorepo root in apps/www Next config

Without this, Next.js's file-trace output references pnpm virtual-store
paths that only exist under the workspace root. Deploying the prebuilt
output from apps/www alone then fails with ENOENT on files like
/node_modules/.pnpm/styled-jsx@…/index.js.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: evangauer

apps/www/next.config.js

@@ -1,4 +1,8 @@
+const path = require("path");
+
 /** @type {import('next').NextConfig} */
-const nextConfig = {};
+const nextConfig = {
+  outputFileTracingRoot: path.join(__dirname, "../.."),
+};
 
 module.exports = nextConfig;