Adds pwa-assets.config.ts that reads $BRAND_DIR (default
./branding/default) and $BRAND_APP (optional per-standalone
override), resolves logo.svg/logo.png with documented fallback
order, and emits the existing icon set (favicon.ico,
icon-{192,512}.png, icon-maskable-{192,512}.png,
apple-touch-icon.png) into public/icons/.
Generator outputs alongside its source, so the config stages the
brand source into public/icons/.brand-source.{svg,png}; gitignoring
public/icons/ covers both staged source and generated icons in one
line.
Adds pnpm script `generate-pwa-assets`. Vite configs / HTML <link>
href updates come in follow-up commits; this commit alone produces
the icon set under public/icons/ but doesn't yet replace the
committed public/*.png binaries.
Part of aiolabs/webapp#95 (brand kit architecture).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
