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- 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>