feat(a11y): implement screen reader support and accessibility optimizations

components/SkipLink.tsx

@@ -0,0 +1,16 @@
+'use client';
+
+import { useTranslations } from 'next-intl';
+
+export default function SkipLink() {
+  const t = useTranslations('Navigation');
+
+  return (
+    <a
+      href="#main-content"
+      className="sr-only focus:not-sr-only focus:fixed focus:top-4 focus:left-4 focus:z-[100] focus:px-6 focus:py-3 focus:bg-white focus:text-primary-dark focus:font-bold focus:rounded-lg focus:shadow-xl focus:outline-none focus:ring-2 focus:ring-accent transition-all"
+    >
+      {t('skipToContent')}
+    </a>
+  );
+}