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/css-tree/lib/definition-syntax/index.js

@@ -0,0 +1,4 @@
+export { SyntaxError } from './SyntaxError.js';
+export { generate } from './generate.js';
+export { parse } from './parse.js';
+export { walk } from './walk.js';