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/unist-util-visit/index.d.ts

@@ -0,0 +1,9 @@
+export type {Test} from 'unist-util-is'
+export type {
+  Action,
+  ActionTuple,
+  Index,
+  VisitorResult
+} from 'unist-util-visit-parents'
+export type {Visitor, BuildVisitor} from './lib/index.js'
+export {CONTINUE, EXIT, SKIP, visit} from './lib/index.js'