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/postcss/lib/fromJSON.d.ts

@@ -0,0 +1,9 @@
+import { JSONHydrator } from './postcss.js'
+
+interface FromJSON extends JSONHydrator {
+  default: FromJSON
+}
+
+declare const fromJSON: FromJSON
+
+export = fromJSON