chore: upgrade to Next.js 16.0.1 with Turbopack

Update from Next.js 15.5.6 to Next.js 16.0.1:
- Now using Turbopack for production builds
- TypeScript config automatically updated (jsx: react-jsx)
- Build time improved with Turbopack
- All features working correctly

Build successful with Next.js 16 + Turbopack! 🚀

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

package.json

@@ -27,10 +27,10 @@
     "cmdk": "^1.0.4",
     "framer-motion": "^11.15.0",
     "lucide-react": "^0.468.0",
-    "next": "^15.1.3",
-    "react": "^19.0.0",
+    "next": "^16.0.1",
+    "react": "^19.2.0",
     "react-colorful": "^5.6.1",
-    "react-dom": "^19.0.0",
+    "react-dom": "^19.2.0",
     "sonner": "^1.7.1",
     "tailwind-merge": "^2.5.5",
     "zustand": "^5.0.2"