feat: add hidden flag to specials

app/[locale]/special/[name]/page.tsx

@@ -86,6 +86,7 @@ export default async function SpecialPage({ params }: PageProps) {
     specials.sort((a, b) => getLocalizedValue(a.name, locale).localeCompare(getLocalizedValue(b.name, locale)));
 
     const activeSpecials = specials.filter(s => {
+        if (s.hidden) return false;
         const sStarted = !s.launchDate || s.launchDate <= now;
         const sEnded = s.endDate && s.endDate < now;
         return sStarted && !sEnded;