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/app/admin/ernten/[id]/page.tsx

@@ -94,7 +94,7 @@ export default async function AdminHarvestEditPage(props: PageProps<"/admin/ernt
           <input type="checkbox" name="isPublished" defaultChecked={harvest.isPublished} />
           {t.adminHarvestEditPage.isPublishedLabel}
         </label>
-        <p className="text-xs text-ink/50">{t.adminHarvestEditPage.isPublishedHint}</p>
+        <p className="text-xs text-ink/70">{t.adminHarvestEditPage.isPublishedHint}</p>
         <button type="submit" className="bg-forest text-cream px-6 py-2 text-sm">
           {t.adminHarvestEditPage.save}
         </button>

src/app/admin/inhalte/page.tsx

@@ -106,7 +106,7 @@ export default async function AdminInhaltePage(props: PageProps<"/admin/inhalte"
                   <p className="text-sm text-ink/70 mb-2">{label}</p>
                   <div className="grid sm:grid-cols-2 gap-4">
                     <label className="block text-xs">
-                      <span className="text-ink/50">{t.adminContentPage.deLabel}</span>
+                      <span className="text-ink/70">{t.adminContentPage.deLabel}</span>
                       {isTextarea ? (
                         <textarea
                           name={`de::${def.key}`}
@@ -126,7 +126,7 @@ export default async function AdminInhaltePage(props: PageProps<"/admin/inhalte"
                       )}
                     </label>
                     <label className="block text-xs">
-                      <span className="text-ink/50">{t.adminContentPage.enLabel}</span>
+                      <span className="text-ink/70">{t.adminContentPage.enLabel}</span>
                       {isTextarea ? (
                         <textarea
                           name={`en::${def.key}`}