Harden CMS security and theme contrast

src/lib/form-data.test.ts

@@ -0,0 +1,18 @@
+import { describe, expect, it } from "vitest";
+import { formPositiveBigInt } from "@/lib/form-data";
+
+describe("formPositiveBigInt", () => {
+  it("parses a positive identifier from FormData", () => {
+    const formData = new FormData();
+    formData.set("id", "42");
+
+    expect(formPositiveBigInt(formData, "id")).toBe(42n);
+  });
+
+  it.each(["", "0", "-1", "1.5", "invalid"])("rejects invalid identifier %s", (value) => {
+    const formData = new FormData();
+    formData.set("id", value);
+
+    expect(formPositiveBigInt(formData, "id")).toBeNull();
+  });
+});