Update receipt logo to match homepage branding

Changed receipt page logo from /puffin-logo.svg to /puffinOffset.webp
to match the logo used on the homepage for consistent branding.

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

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

src/pages/CheckoutSuccess.tsx

@@ -163,7 +163,7 @@ export default function CheckoutSuccess({
               className="bg-gradient-to-br from-cyan-500 via-blue-500 to-indigo-600 p-8 text-center"
             >
               <img
-                src="/puffin-logo.svg"
+                src="/puffinOffset.webp"
                 alt="Puffin Offset"
                 className="h-24 mx-auto mb-4 print-logo"
               />