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/postcss.mjs

@@ -0,0 +1,30 @@
+import postcss from './postcss.js'
+
+export default postcss
+
+export const stringify = postcss.stringify
+export const fromJSON = postcss.fromJSON
+export const plugin = postcss.plugin
+export const parse = postcss.parse
+export const list = postcss.list
+
+export const document = postcss.document
+export const comment = postcss.comment
+export const atRule = postcss.atRule
+export const rule = postcss.rule
+export const decl = postcss.decl
+export const root = postcss.root
+
+export const CssSyntaxError = postcss.CssSyntaxError
+export const Declaration = postcss.Declaration
+export const Container = postcss.Container
+export const Processor = postcss.Processor
+export const Document = postcss.Document
+export const Comment = postcss.Comment
+export const Warning = postcss.Warning
+export const AtRule = postcss.AtRule
+export const Result = postcss.Result
+export const Input = postcss.Input
+export const Rule = postcss.Rule
+export const Root = postcss.Root
+export const Node = postcss.Node