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/actions/runtime/virtual.d.ts

@@ -0,0 +1,4 @@
+import type { ActionClient } from './server.js';
+export * from 'virtual:astro:actions/runtime';
+export declare function getActionPath(action: ActionClient<any, any, any>): string;
+export declare const actions: Record<string | symbol, any>;