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/oniguruma-parser/dist/optimizer/transforms/remove-empty-groups.d.ts

@@ -0,0 +1,7 @@
+import type { Visitor } from '../../traverser/traverse.js';
+/**
+Remove empty noncapturing, atomic, and flag groups, even if quantified.
+*/
+declare const removeEmptyGroups: Visitor;
+export { removeEmptyGroups, };
+//# sourceMappingURL=remove-empty-groups.d.ts.map