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/prefetch/vite-plugin-prefetch.d.ts

@@ -0,0 +1,5 @@
+import type * as vite from 'vite';
+import type { AstroSettings } from '../types/astro.js';
+export default function astroPrefetch({ settings }: {
+    settings: AstroSettings;
+}): vite.Plugin;