Admins set the default mode, contrast and color on Settings > Display,
shown as three labelled form rows below the Theme select. Logged-in
users' choices are saved on their account and override only the parts
they changed; anonymous visitors get the default.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Generate medium/high contrast schemes, add a custom swatch that builds a scheme
in the browser via lazy-loaded scheme.js, allow Theme Builder exports as palettes.
Drop the teal palette and spread the swatches across the menu width.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>