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/env/vite-plugin-import-meta-env.d.ts

@@ -0,0 +1,7 @@
+import type * as vite from 'vite';
+import type { EnvLoader } from './env-loader.js';
+interface EnvPluginOptions {
+    envLoader: EnvLoader;
+}
+export declare function importMetaEnv({ envLoader }: EnvPluginOptions): vite.Plugin;
+export {};