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/node-mock-http/dist/_polyfill/buffer/node.d.ts

@@ -0,0 +1,2 @@
+export { Buffer } from 'node:buffer';
+import 'node:events';