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/assets/utils/svg.d.ts

@@ -0,0 +1,3 @@
+import type { AstroConfig } from '../../types/public/config.js';
+import type { ImageMetadata } from '../types.js';
+export declare function makeSvgComponent(meta: ImageMetadata, contents: Buffer | string, svgoConfig: AstroConfig['experimental']['svgo']): string;