docs(demo): Revert back to nextjs 15 because stackblitz doesn't run node 22

Author: ntucker

examples/nextjs/app/[userId]/layout.tsx

@@ -1,3 +1,4 @@
+import { AsyncBoundary } from '@data-client/react';
 import Link from 'next/link';
 
 import UserSelection from '@/components/todo/UserSelection';
@@ -19,7 +20,7 @@ export default async function TodoLayout(props: {
 
       <UserSelection userId={Number(params.userId)} />
 
-      {children}
+      <AsyncBoundary>{children}</AsyncBoundary>
 
       <p>
         No fetch requests took place on the client. The client is immediately

examples/nextjs/package-lock.json

@@ -3,7 +3,7 @@
   "version": "0.1.10",
   "private": true,
   "scripts": {
-    "dev": "next dev --webpack",
+    "dev": "next dev",
     "prebuild": "next telemetry disable",
     "build": "next build",
     "start": "next start",
@@ -27,7 +27,7 @@
     "@types/react-dom": "19.2.3",
     "clsx": "^2.1.1",
     "core-js": "^3.40.0",
-    "next": "^16.0.0",
+    "next": "15.4.10",
     "react": "19.2.3",
     "react-dom": "19.2.3",
     "tar-fs": "^3.0.6",

examples/nextjs/package.json

@@ -17,7 +17,7 @@
     "moduleResolution": "node",
     "resolveJsonModule": true,
     "isolatedModules": true,
-    "jsx": "react-jsx",
+    "jsx": "preserve",
     "incremental": true,
     "paths": {
       "@/*": [