Enhance post date display with loading state for unpublished posts

src/app/posts/[...slug]/page.tsx

@@ -53,7 +53,17 @@ export default function PostPage({ params }: { params: { slug: string[] } }) {
       
       <h1 className="text-4xl font-bold mb-4">{post.title}</h1>
       <div className="text-gray-600 mb-8">
-        <div>Veröffentlicht: {format(new Date(post.date), 'd. MMMM yyyy')}</div>
+        {post.date ? (
+          <div>Veröffentlicht: {format(new Date(post.date), 'd. MMMM yyyy')}</div>
+        ) : (
+          <div className="flex flex-col items-center">
+            <div className="flex">
+              <span className="text-2xl animate-spin mr-2">⚙️</span>
+              <span className="text-2xl animate-spin-reverse">⚙️</span>
+            </div>
+            <div className="text-xl font-bold mt-2">In Bearbeitung</div>
+          </div>
+        )}
         <div>Erstellt: {format(new Date(post.createdAt), 'd. MMMM yyyy HH:mm')}</div>
       </div>