Align arena width to layout

- Constrain Presents Puzzle arena width to match top navigation by applying max-w-6xl container in PresentsPuzzle page
- Ensure the content area lines up with the menu endpoints for a consistent layout

X-Lovable-Edit-ID: edt-95431621-f64c-4374-b529-5daafa5aeda1

src/pages/PresentsPuzzlePage.tsx

@@ -4,7 +4,7 @@ import PresentsPuzzle from "@/components/PresentsPuzzle";
 const PresentsPuzzlePage = () => {
   return (
     <Layout>
-      <div className="container mx-auto px-4 py-8">
+      <div className="max-w-6xl mx-auto px-4 py-8">
         <PresentsPuzzle showSocialShare={true} />
       </div>
     </Layout>