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/astro/dist/toolbar/index.js

@@ -0,0 +1,6 @@
+function defineToolbarApp(app) {
+  return app;
+}
+export {
+  defineToolbarApp
+};