fix: raise text-ink/50 contrast to WCAG AA across 8 files

Live Lighthouse audit of /konto found the same class of bug as the
prior checkout/cart commit, one shade lighter: text-ink/50 measures
3.08:1 against the cream background, under the 4.5:1 WCAG AA minimum
for normal-size text. Grepped for every other use of the same token
(login divider, language switcher, sold-out label, admin image-upload
status text, admin hint text) and bumped them all to text-ink/70
(5.61:1, same value used in the earlier checkout fix) for one
consistent, compliant muted-text shade. Verified: tsc clean, 151/151
tests pass, /konto Lighthouse accessibility 96 -> 100.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

src/components/language-switcher.tsx

@@ -38,7 +38,7 @@ export function LanguageSwitcher({ className = "" }: { className?: string }) {
             aria-current={code === locale}
             title={localeLabels[code]}
             className={`uppercase tracking-wide transition-colors disabled:opacity-50 ${
-              code === locale ? "text-forest font-medium" : "text-ink/50 hover:text-forest"
+              code === locale ? "text-forest font-medium" : "text-ink/70 hover:text-forest"
             }`}
           >
             {code}