Initialize and configure assistant-ui chat UI in Next.js projects or create new apps from templates.

• Supports two workflows: init for existing Next.js projects and create for new apps, with six starter templates covering AI SDK, cloud persistence, Clerk auth, LangGraph, and MCP integrations
• CLI flags enable non-interactive setup (--yes), template selection (-t), preset configuration (--preset), and component registry additions (add)
• Reference documentation covers advanced runtimes including LangGraph, custom backends, external state management, and non-Next.js frameworks like Vite and TanStack Start
• Includes component registry for adding pre-built UI elements like markdown text and thread lists