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-parents/index.d.ts

@@ -0,0 +1,14 @@
+export type {Test} from 'unist-util-is'
+export type {
+  Action,
+  ActionTuple,
+  BuildVisitor,
+  // Undocumented: used in `unist-util-visit`:
+  InclusiveDescendant,
+  Index,
+  // Undocumented: used in `unist-util-visit`:
+  Matches,
+  Visitor,
+  VisitorResult
+} from './lib/index.js'
+export {CONTINUE, EXIT, SKIP, visitParents} from './lib/index.js'