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/cli/create-key/infra/crypto-key-generator.d.ts

@@ -0,0 +1,4 @@
+import type { KeyGenerator } from '../definitions.js';
+export declare class CryptoKeyGenerator implements KeyGenerator {
+    generate(): Promise<string>;
+}