Extract CSS from TypeScript template literals into standalone .css files
(variables.css, layout.css, components.css, utilities.css) and update
src/routes/admin/ui.tsx to import them directly via Wrangler text imports,
concatenating the strings at runtime for the inline <style> tag.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Julien Herr