Update Next.js Configuration to Support Monorepo Package Bundling

- Added `transpilePackages` configuration in `next.config.mjs` to ensure proper bundling of the `@customer-portal/domain` package in the monorepo setup, enhancing build efficiency and compatibility.

apps/portal/next.config.mjs

@@ -14,6 +14,9 @@ const useDirectApiBase = Boolean(directApiBase && directApiBase.trim().startsWit
 const nextConfig = {
   output: process.env.NODE_ENV === "production" ? "standalone" : undefined,
 
+  // Required for monorepo workspace packages to be bundled correctly
+  transpilePackages: ["@customer-portal/domain"],
+
   turbopack: {
     resolveAlias: {
       "@customer-portal/domain": path.join(workspaceRoot, "packages/domain/dist"),