fix(a11y): WCAG AA contrast retune for the Otter Orange palette (#567)

Fixes #557. Vivid fill, ink label: brand #E07832 stays on fills while primary-foreground flips to #1A1814 (5.83:1); new theme-aware ink tokens carry orange, destructive, and success text roles; opacity-modified text purged; landing, demo, and the docs fund button retuned. Guarded by a CSS-parsing unit contrast test, rebuilt axe baselines with zero contrast entries, a new landing axe smoke, and fully regenerated darwin visual baselines.

apps/web/src/components/tools/extract-subtitles-settings.tsx

@@ -25,7 +25,7 @@ export function ExtractSubtitlesSettings() {
 
   return (
     <div className="space-y-4">
-      {error && <p className="text-xs text-red-500">{error}</p>}
+      {error && <p className="text-xs text-destructive-ink">{error}</p>}
 
       {processing ? (
         <ProgressCard