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/components/index.ts

@@ -0,0 +1,6 @@
+// The `ts-ignore` comments here are necessary because we're importing this file inside the `astro:components`
+// virtual module's types, which means that `tsc` will try to resolve these imports.
+// @ts-ignore
+export { default as Code } from './Code.astro';
+// @ts-ignore
+export { default as Debug } from './Debug.astro';