Adds the canonical brand definition used by the v0.42.0 brand refresh:
- client/lib/brand.ts — single source of truth for name, tagline,
repository URL, asset paths, navigation glyphs, and accent palette
(BRAND_GLYPHS / accent tokens consumed by Brand.tsx + page chrome).
- client/components/brand/Brand.tsx — BrandMark (img with the
logo asset), BrandWordmark, BrandGlyph, and a small BrandStack
used by the layout chrome.
- client/public/brand/{logo,pwa-192,pwa-512,apple-touch-icon}.png —
replaces the inline img-cut references in README/HISTORY with a
canonical set; PWA manifest + favicon now point here.
This is commit 1 of 9 splitting the working-tree brand refresh into
per-layer commits. Each commit is independently buildable; the order
matches the dependency direction (lib → component → chrome → UI
primitives → page consumers → admin/dialog consumers → docs).
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