fix: use readable text color in docs light mode (#1046)
--sl-color-white was set to #fafafa in light mode, but Starlight uses
this variable for high-contrast foreground text. fix it to #171717
(matching --sl-color-gray-1) so text is dark on light backgrounds,
consistent with how Starlight's own defaults flip this variable.
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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