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-astro/metadata.d.ts

@@ -0,0 +1,4 @@
+import type { ModuleInfo } from '../core/module-loader/index.js';
+import type { PluginMetadata } from './types.js';
+export declare function getAstroMetadata(modInfo: ModuleInfo): PluginMetadata['astro'] | undefined;
+export declare function createDefaultAstroMetadata(): PluginMetadata['astro'];