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/trough/index.js

@@ -0,0 +1,9 @@
+/**
+ * @typedef {import('./lib/index.js').Callback} Callback
+ * @typedef {import('./lib/index.js').Middleware} Middleware
+ * @typedef {import('./lib/index.js').Pipeline} Pipeline
+ * @typedef {import('./lib/index.js').Run} Run
+ * @typedef {import('./lib/index.js').Use} Use
+ */
+
+export {trough, wrap} from './lib/index.js'