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/jiti/lib/jiti-register.mjs

@@ -0,0 +1,4 @@
+// https://nodejs.org/api/module.html#moduleregisterspecifier-parenturl-options
+import { register } from "node:module";
+
+register("./jiti-hooks.mjs", import.meta.url, {});