Fills in the design tokens proposed for the app (palette, type scale,
shadows/radii, and a real dark theme) and applies them to the existing
auth and home pages:
- _theme.scss: full token set — basil/vermillion/turmeric/raspberry
palette, heading type scale (was missing above --font-size-base),
elevation/radius scale, and a working dark theme via
prefers-color-scheme (color-scheme: light dark was declared but
unused). Includes a 3-tier allergen/intolerance color scale, kept
distinct from --color-error, for when the recipe/allergy feature
lands — not yet consumed by any component.
- global.scss: box-sizing reset, headings on the display font stack,
visible focus ring.
- auth-form.scss / HomePage.scss(+tsx): both screens now render their
content on a raised card (--color-surface, radius, shadow) instead
of directly on the page background, so login/signup and home read
as one coherent app.
Also adds .claude/launch.json (pnpm --filter web dev, port 5173) used
to preview the change locally.
Verified: `vite build` passes; computed styles checked live against
the token values in both themes.
