sfnext-theming

Re-brand and re-skin a Storefront Next storefront: change the color palette, corner radius and shadows (shape tokens), header and footer colors, typography and web fonts, logo, favicon, hero scrims, and brand copy, with WCAG contrast checks. Use when asked to rebrand or restyle the storefront, change the primary color, swap the font, make the header dark, make cards rounded or flat, replace the logo, edit src/theme, core.css, header.css, brand.css, tailwind.css, base.css, or src/lib/fonts.ts, or verify a theme change in the Design System Storybook stories. Do not use for building or styling an individual component (use storefront-next:sfnext-components), Figma kit sync (use storefront-next-figma:sfnext-create-figma-kit), or site configuration (use storefront-next:sfnext-configuration).