Brand.tsx (101 line churn) and brand.ts (47 line churn) now expose
the new SVG-first primitives:
- BrandMark: <img> with BRAND.assets.mark (vector, scales to any size).
- BrandWordmark: text fallback if the mark is unavailable.
- BrandLockup: the combined mark + wordmark for the layout chrome,
honours the light/dark variant via CSS variables.
- BrandGlyph: unchanged but re-uses the new accent tokens.
brand.ts adds the new asset-path constants (mark, markMono, lockup,
lockupLight, socialPreview) and a tokens helper so the lockup can
switch variants without prop drilling.
This is commit 2 of the v0.42.0 follow-up batch. Depends on
720d31b (SVG assets).
1c04dfdf8c