fix: Fix product page syntax errors

1. Remove duplicate/broken code in product tables section
2. Fix PostCSS config for Tailwind 4
3. Add @tailwindcss/postcss dependency
4. Remove --production flag from Dockerfile (sharp required)

All fixes enable successful Docker build with favicon working.

node_modules/crossws/dist/websocket/node.mjs

@@ -0,0 +1,15 @@
+import { a as _WebSocket } from '../shared/crossws.CipVM6lf.mjs';
+import 'stream';
+import 'events';
+import 'http';
+import 'crypto';
+import 'buffer';
+import 'zlib';
+import 'https';
+import 'net';
+import 'tls';
+import 'url';
+
+const Websocket = globalThis.WebSocket || _WebSocket;
+
+export { Websocket as default };