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/infra/process-operating-system-provider.d.ts

@@ -0,0 +1,6 @@
+import type { OperatingSystemProvider } from '../definitions.js';
+export declare class ProcessOperatingSystemProvider implements OperatingSystemProvider {
+    #private;
+    readonly name: NodeJS.Platform;
+    readonly displayName: string;
+}