next.js example (#694)

* next.js guide

* better

* shadcn

* fixes

* fix: correct screenshot test assertion to check path instead of base64

The daemon returns { path: savePath } for screenshot commands, not base64.

* fix: cross-platform Chrome detection and gitignore hardening

- Replace hardcoded macOS Chrome path with findLocalChrome() that
  searches common paths on macOS, Linux, and WSL, with a clear error
  message when no Chrome is found.
- Add .env and .env*.local to .gitignore to prevent accidental
  secret commits.

* fix: correct Vercel deploy button repo URL to vercel-labs/agent-browser

* clean up

* demo

* next page

---------

Co-authored-by: ctate <366502+ctate@users.noreply.github.com>

examples/demo/package.json

@@ -0,0 +1,37 @@
+{
+  "name": "agent-browser-demo",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start",
+    "lint": "next lint"
+  },
+  "dependencies": {
+    "@base-ui/react": "^1.2.0",
+    "@sparticuz/chromium": "^143.0.4",
+    "@tailwindcss/postcss": "^4.2.1",
+    "@vercel/sandbox": "^1.0.0",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
+    "geist": "^1.7.0",
+    "lucide-react": "^0.577.0",
+    "next": "^16.1.6",
+    "postcss": "^8.5.8",
+    "puppeteer-core": "^24.38.0",
+    "react": "^19.2.4",
+    "react-dom": "^19.2.4",
+    "react-resizable-panels": "^4.7.2",
+    "shadcn": "^4.0.2",
+    "tailwind-merge": "^3.5.0",
+    "tailwindcss": "^4.2.1",
+    "tw-animate-css": "^1.4.0"
+  },
+  "devDependencies": {
+    "@types/node": "^22.0.0",
+    "@types/react": "^19.2.14",
+    "@types/react-dom": "^19.2.3",
+    "typescript": "^5.6.0"
+  }
+}