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/zod/v4/locales/sl.d.ts

@@ -0,0 +1,4 @@
+import type * as errors from "../core/errors.js";
+export default function (): {
+    localeError: errors.$ZodErrorMap;
+};