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/zod/v3/helpers/errorUtil.js

@@ -0,0 +1,6 @@
+export var errorUtil;
+(function (errorUtil) {
+    errorUtil.errToObj = (message) => typeof message === "string" ? { message } : message || {};
+    // biome-ignore lint:
+    errorUtil.toString = (message) => typeof message === "string" ? message : message?.message;
+})(errorUtil || (errorUtil = {}));