fix(types): fix typescript errors breaking the pipeline

app/[locale]/[slug]/page.tsx

@@ -169,7 +169,7 @@ export default async function Page(props: { params: Promise<{ locale: string; sl
       id: r.slug,
       slug: r.slug,
       title: r.frontmatter.title,
-      category: r.frontmatter.category || 'Projekt',
+      category: Array.isArray(r.frontmatter.category) ? r.frontmatter.category[0] : (r.frontmatter.category || 'Projekt'),
       image: r.frontmatter.featuredImage
     }))} />,
   };