Expert guidance for @cronocode/react-box — a React runtime CSS-in-JS library where the Box component accepts ~144 CSS props and generates CSS classes at runtime. Prevents common AI mistakes: inline styles, wrong tag usage, incorrect numeric formatters (fontSize divider 16, spacing divider 4, border direct px). Covers all component shortcuts, Dropdown compound pattern, Select data-driven pattern, DataGrid with filtering/sorting/pagination, theme system with localStorage persistence, Box.extend() for custom props, and Box.components() for style customization with variants.