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/@shikijs/engine-javascript/dist/engine-raw.d.mts

@@ -0,0 +1,12 @@
+import { RegexEngine } from '@shikijs/types';
+
+/**
+ * Raw JavaScript regex engine that only supports precompiled grammars.
+ *
+ * This further simplifies the engine by excluding the regex compilation step.
+ *
+ * Zero dependencies.
+ */
+declare function createJavaScriptRawEngine(): RegexEngine;
+
+export { createJavaScriptRawEngine };