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/v4/classic/tests/stringbool.test.ts

@@ -0,0 +1,66 @@
+import { expect, expectTypeOf, test } from "vitest";
+import * as z from "zod/v4";
+
+test("z.stringbool", () => {
+  const a = z.stringbool();
+  type a = z.infer<typeof a>;
+  expectTypeOf<a>().toEqualTypeOf<boolean>();
+  type a_in = z.input<typeof a>;
+  expectTypeOf<a_in>().toEqualTypeOf<string>();
+
+  expect(z.parse(a, "true")).toEqual(true);
+  expect(z.parse(a, "yes")).toEqual(true);
+  expect(z.parse(a, "1")).toEqual(true);
+  expect(z.parse(a, "on")).toEqual(true);
+  expect(z.parse(a, "y")).toEqual(true);
+  expect(z.parse(a, "enabled")).toEqual(true);
+  expect(z.parse(a, "TRUE")).toEqual(true);
+
+  expect(z.parse(a, "false")).toEqual(false);
+  expect(z.parse(a, "no")).toEqual(false);
+  expect(z.parse(a, "0")).toEqual(false);
+  expect(z.parse(a, "off")).toEqual(false);
+  expect(z.parse(a, "n")).toEqual(false);
+  expect(z.parse(a, "disabled")).toEqual(false);
+  expect(z.parse(a, "FALSE")).toEqual(false);
+
+  expect(z.safeParse(a, "other")).toMatchObject({ success: false });
+  expect(z.safeParse(a, "")).toMatchObject({ success: false });
+  expect(z.safeParse(a, undefined)).toMatchObject({ success: false });
+  expect(z.safeParse(a, {})).toMatchObject({ success: false });
+  expect(z.safeParse(a, true)).toMatchObject({ success: false });
+  expect(z.safeParse(a, false)).toMatchObject({ success: false });
+});
+
+test("custom values", () => {
+  const b = z.stringbool({
+    truthy: ["y"],
+    falsy: ["N"],
+  });
+  expect(z.parse(b, "y")).toEqual(true);
+  expect(z.parse(b, "Y")).toEqual(true);
+  expect(z.parse(b, "n")).toEqual(false);
+  expect(z.parse(b, "N")).toEqual(false);
+  expect(z.safeParse(b, "true")).toMatchObject({ success: false });
+  expect(z.safeParse(b, "false")).toMatchObject({ success: false });
+});
+
+test("custom values - case sensitive", () => {
+  const c = z.stringbool({
+    truthy: ["y"],
+    falsy: ["N"],
+    case: "sensitive",
+  });
+  expect(z.parse(c, "y")).toEqual(true);
+  expect(z.safeParse(c, "Y")).toMatchObject({ success: false });
+  expect(z.parse(c, "N")).toEqual(false);
+  expect(z.safeParse(c, "n")).toMatchObject({ success: false });
+  expect(z.safeParse(c, "TRUE")).toMatchObject({ success: false });
+});
+
+// test custom error messages
+test("z.stringbool with custom error messages", () => {
+  const a = z.stringbool("wrong!");
+
+  expect(() => a.parse("")).toThrowError("wrong!");
+});