Fix wishlist link to point at the actual page

[saurabhhhcodes]

What changed

• Updated the wishlist button in frontend/index.html to point at the actual sibling page (./wishlist.html) instead of the non-functional static path.

Why

The wishlist page already exists in the frontend bundle, but the old link pointed at a path that does not match the repo layout. This made the shortcut look real while sending users to the wrong place.

Validation

• git diff --check
• curl -I http://127.0.0.1:8123/wishlist.html returned 200 OK
• Confirmed frontend/index.html now renders ./wishlist.html

Closes #1638

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