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/prerender/utils.d.ts

@@ -0,0 +1,11 @@
+import type { AstroSettings } from '../types/astro.js';
+import type { AstroConfig } from '../types/public/config.js';
+export declare function getPrerenderDefault(config: AstroConfig): boolean;
+/**
+ * Returns the correct output directory of the SSR build based on the configuration
+ */
+export declare function getServerOutputDirectory(settings: AstroSettings): URL;
+/**
+ * Returns the correct output directory of the client build based on the configuration
+ */
+export declare function getClientOutputDirectory(settings: AstroSettings): URL;