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-head/index.d.ts

@@ -0,0 +1,5 @@
+import type * as vite from 'vite';
+import type { BuildInternals } from '../core/build/internal.js';
+import type { AstroBuildPlugin } from '../core/build/plugin.js';
+export default function configHeadVitePlugin(): vite.Plugin;
+export declare function astroHeadBuildPlugin(internals: BuildInternals): AstroBuildPlugin;