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/regex/dist/cjs/backcompat.d.ts

@@ -0,0 +1,8 @@
+/**
+Applies flag v rules when using flag u, for forward compatibility.
+Assumes flag u and doesn't worry about syntax errors that are caught by it.
+@param {string} expression
+@returns {PluginResult}
+*/
+export function backcompatPlugin(expression: string): PluginResult;
+import type { PluginResult } from './regex.js';