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/src/v3/tests/mocker.test.ts

@@ -0,0 +1,19 @@
+// @ts-ignore TS6133
+import { test } from "vitest";
+
+import { Mocker } from "./Mocker.js";
+
+test("mocker", () => {
+  const mocker = new Mocker();
+  mocker.string;
+  mocker.number;
+  mocker.boolean;
+  mocker.null;
+  mocker.undefined;
+  mocker.stringOptional;
+  mocker.stringNullable;
+  mocker.numberOptional;
+  mocker.numberNullable;
+  mocker.booleanOptional;
+  mocker.booleanNullable;
+});