• Use Next.js App Router, React, TypeScript, and Tailwind CSS.
• Default to Server Components. Add 'use client' only for hooks, events, lifecycle, or browser APIs.
• Use next/link for internal links and next/image for static images.
• Use Spring DS tokens. Do not add raw hex, arbitrary spacing, or generic non-system style tokens.
• Use the 4px spacing grid, Inter typography, and established radius tokens.
• Public package UI exports belong in packages/spring-ds-react/src/index.ts.
• Internal gallery and AppFlow previews must not include production APIs, analytics, database calls, or partner integrations.