- text-gray-900/800 → text-fg
- text-gray-700 → text-fg-2
- text-gray-600 → text-fg-muted
- text-gray-500 → text-fg-muted
- text-gray-400 → text-fg-disabled
- bg-white → bg-surface
- border-gray-200/300 → border-border
- border-gray-100 → border-border-subtle
- bg-gray-50/bg-gray-100 → bg-surface-subtle
- Preserved syntax-highlight grays inside bg-gray-950 code blocks

Affected: overview, selection, layout, display, overlay, navigation,
          form, data, icons, color-system, llm-txt sections

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>