platformr's catalog.go and request.go had inline-hardcoded copies of the
exact same hex values for custom per-column table styling that couldn't
be expressed with the existing string-returning helpers (Green, Subtle,
etc). Exporting the AdaptiveColor values directly lets that kind of
bespoke styling reference the canonical palette instead of duplicating it.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>