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/tailwindcss/dist/plugin.js

@@ -0,0 +1 @@
+"use strict";function g(i,n){return{handler:i,config:n}}g.withOptions=function(i,n=()=>({})){function t(o){return{handler:i(o),config:n(o)}}return t.__isOptionsFunction=!0,t};var u=g;module.exports=u;