Update Next.js configuration and improve Sentry integration

- Added `serverExternalPackages` to the Next.js configuration to exclude Node-only packages from the webpack bundle, enhancing compatibility with React's RSC/client boundary.
- Refactored Sentry initialization and exception capturing to be asynchronous, ensuring proper handling of the Sentry DSN and preventing potential issues during Next.js builds.
- Updated the `Toaster` component import in the layout to improve UI consistency.

apps/webui/src/app/layout.tsx

@@ -1,9 +1,9 @@
 import type { Metadata } from 'next';
 import { Inter } from 'next/font/google';
 import type { ReactNode } from 'react';
-import { Toaster } from 'sonner';
 import { LocaleProvider } from '@/components/locale-provider';
 import { ThemeProvider } from '@/components/layout/theme-provider';
+import { Toaster } from '@/components/ui/toaster';
 import { getLocale, MESSAGES } from '@/lib/i18n';
 import './globals.css';
 
@@ -23,7 +23,7 @@ export default async function RootLayout({ children }: { children: ReactNode })
         <ThemeProvider>
           <LocaleProvider locale={locale} messages={MESSAGES[locale]}>
             {children}
-            <Toaster richColors position="top-right" />
+            <Toaster />
           </LocaleProvider>
         </ThemeProvider>
       </body>

apps/webui/src/components/ui/toaster.tsx

@@ -0,0 +1,7 @@
+'use client';
+
+import { Toaster as SonnerToaster } from 'sonner';
+
+export function Toaster() {
+  return <SonnerToaster richColors position="top-right" />;
+}

apps/webui/src/instrumentation.ts

@@ -1,6 +1,6 @@
 export async function register(): Promise<void> {
   if (process.env.NEXT_RUNTIME === 'nodejs') {
     const { initWebuiSentry } = await import('./lib/sentry');
-    initWebuiSentry();
+    await initWebuiSentry();
   }
 }

apps/webui/src/lib/sentry.ts

@@ -1,17 +1,23 @@
-import * as Sentry from '@sentry/node';
-import { env } from './env';
-
 let initialized = false;
 
-export function initWebuiSentry(): void {
-  if (initialized || !env.SENTRY_DSN) {
+export async function initWebuiSentry(): Promise<void> {
+  if (initialized) {
     return;
   }
+  const dsn = process.env.SENTRY_DSN?.trim();
+  if (!dsn) {
+    return;
+  }
+
+  // Import only when a DSN is configured. Loading `@sentry/node` at module
+  // scope patches Node builtins and can break Next.js page-data collection
+  // (`createContext is not a function`) during `next build`.
+  const Sentry = await import('@sentry/node');
   Sentry.init({
-    dsn: env.SENTRY_DSN,
-    environment: env.NODE_ENV,
+    dsn,
+    environment: process.env.NODE_ENV ?? 'production',
     release: 'nexumi-webui@0.1.0',
-    tracesSampleRate: env.NODE_ENV === 'production' ? 0.1 : 1.0,
+    tracesSampleRate: process.env.NODE_ENV === 'production' ? 0.1 : 1.0,
     initialScope: {
       tags: { service: 'webui' }
     }
@@ -19,10 +25,15 @@ export function initWebuiSentry(): void {
   initialized = true;
 }
 
-export function captureWebuiException(error: unknown, context?: Record<string, unknown>): void {
-  if (!env.SENTRY_DSN) {
+export async function captureWebuiException(
+  error: unknown,
+  context?: Record<string, unknown>
+): Promise<void> {
+  const dsn = process.env.SENTRY_DSN?.trim();
+  if (!dsn) {
     return;
   }
+  const Sentry = await import('@sentry/node');
   Sentry.withScope((scope) => {
     if (context) {
       scope.setExtras(context);