Fix page width overflow issue and remove Favorite Card heading

- Reduce excessive scale values in animations (scale(50) → scale(3), scale(8) → scale(2.5))
- Add overflow: hidden to card-wrapper to prevent animation overflow
- Remove "Favorite Card" heading from user page
- Fix page width expanding issue caused by large-scale animations

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/components/pages/UserPage.tsx

@@ -63,7 +63,6 @@ export default function UserPage() {
                 if (favCard) {
                   return (
                     <div className="mb-8">
-                      <h2 className="text-xl font-bold mb-4 text-center">Favorite Card</h2>
                       <div className="flex justify-center">
                         <SpecialCard card={favCard} />
                       </div>