All gradient backgrounds (bg-gradient-to-r/br, from-*, via-*, to-*)
were not rendering because the classes weren't in the compiled Tailwind
CSS. Added 60+ gradient utility classes to tractatus-theme.css so
gradients render correctly site-wide.
Fixes white-on-white text in Koha section (gradient background was
transparent, making white text invisible against page background).
Also fixes Production Evidence section and all other gradient sections.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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