Styling

Choice: Web is Tailwind v4, Expo is Uniwind, design prototypes use Tailwind via CDN with the shared tailwind.config.js and shared.css. apps/web/src/app/globals.css holds the import, the @theme inline brand tokens and one @layer base border rule. No StyleSheet.create.

Rejected: no global stylesheet or helper classes at all (the shared design shell carries shared.css).