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/shared/crossws.By9qWDAI.mjs

@@ -0,0 +1,8 @@
+class WSError extends Error {
+  constructor(...args) {
+    super(...args);
+    this.name = "WSError";
+  }
+}
+
+export { WSError as W };