18c90653d4
All tokens with dark-mode overrides gain a private --_name counterpart in :root. Public tokens (--color-*, --module-*, --glass-* etc.) become stable var(--_name) references. Both dark blocks now only override compact private tokens — no more manual two-block sync for every future colour change. Also removes the redundant --color-surface-2 dark override (already auto-derived via var(--neutral-50)). No visual change. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>