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/semver/internal/debug.js

@@ -0,0 +1,11 @@
+'use strict'
+
+const debug = (
+  typeof process === 'object' &&
+  process.env &&
+  process.env.NODE_DEBUG &&
+  /\bsemver\b/i.test(process.env.NODE_DEBUG)
+) ? (...args) => console.error('SEMVER', ...args)
+  : () => {}
+
+module.exports = debug