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/content/loaders/index.d.ts

@@ -0,0 +1,3 @@
+export { file } from './file.js';
+export { glob } from './glob.js';
+export * from './types.js';