fix: 맨 위로 버튼과 카카오 플로팅 버튼 겹침 해결

scroll-to-top 버튼 bottom 2rem → 5.5rem 으로 상향
- website/page.tsx
- website/samples/interior/page.tsx
- website/samples/reading/page.tsx
- website/samples/shopping/page.tsx

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/services/website/samples/shopping/page.tsx

@@ -751,7 +751,7 @@ export default function ShoppingPage() {
       ════════════════════════════════════════════ */}
       <button onClick={scrollTop} aria-label="맨 위로"
         style={{
-          position: 'fixed', bottom: '2rem', right: '2rem', zIndex: 200,
+          position: 'fixed', bottom: '5.5rem', right: '2rem', zIndex: 200,
           width: 46, height: 46,
           background: T.ink, border: 'none', cursor: 'pointer',
           display: 'flex', alignItems: 'center', justifyContent: 'center',