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/ohash/dist/index.mjs

@@ -0,0 +1,10 @@
+import { s as serialize } from './shared/ohash.D__AXeF1.mjs';
+export { i as isEqual } from './shared/ohash.D__AXeF1.mjs';
+import { digest } from 'ohash/crypto';
+export { digest } from 'ohash/crypto';
+
+function hash(input) {
+  return digest(serialize(input));
+}
+
+export { hash, serialize };