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/vite-plugin-hmr-reload/index.d.ts

@@ -0,0 +1,7 @@
+import type { Plugin } from 'vite';
+/**
+ * The very last Vite plugin to reload the browser if any SSR-only module are updated
+ * which will require a full page reload. This mimics the behaviour of Vite 5 where
+ * it used to unconditionally reload for us.
+ */
+export default function hmrReload(): Plugin;