fix(ui): change error description text color for light mode visibility

app/[locale]/error.tsx

@@ -49,7 +49,7 @@ export default function Error({
         {t('title')}
       </Heading>
 
-      <p className="text-white/60 mb-10 max-w-md text-lg">{t('description')}</p>
+      <p className="text-text-secondary mb-10 max-w-md text-lg">{t('description')}</p>
 
       <div className="flex flex-col sm:flex-row gap-4">
         <Button onClick={() => reset()} variant="saturated" size="lg">