- Theme is now class-based (.dark on <html>) with a System/Light/Dark toggle in
the sidebar, persisted to localStorage and applied pre-paint by an inline
script (no flash). Replaces the prefers-color-scheme-only behavior, so a phone
on a light OS theme can still choose dark and vice versa.
- New brand-derived --line token (Ink at 55%): a dark line on the light paper,
light on dark. The family-chart tree connectors had the library's default
white stroke and were invisible in light mode — now they use --line, as do
the pedigree brackets and the fan-chart sectors.
- Light/dark tokens use the exact brand palette (Ink/Muted flip; Bronze/Paper
constant).
Frontend only — no migration.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
