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/meme-generator-preview.tsx

@@ -452,7 +452,7 @@ function ErrorView() {
         <button
           type="button"
           onClick={() => window.location.reload()}
-          className="text-xs text-primary hover:underline"
+          className="text-xs text-primary-ink hover:underline"
         >
           Retry
         </button>