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/devalue/index.js

@@ -0,0 +1,4 @@
+export { uneval } from './src/uneval.js';
+export { parse, unflatten } from './src/parse.js';
+export { stringify } from './src/stringify.js';
+export { DevalueError } from './src/utils.js';