Remove Tailwind CDN script from index.html

Vite already compiles Tailwind via globals.css, so the runtime CDN
script duplicated styles and slowed first paint.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

index.html

@@ -4,7 +4,6 @@
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Shopify Storefront</title>
-    <script src="https://cdn.jsdelivr.net/npm/@tailwindcss/browser@4"></script>
     <link
       rel="stylesheet"
       href="https://esm.sh/@reacteditor/core@0.0.10/dist/index.css"