switch to vitest

ui/vitest.config.ts

@@ -0,0 +1,13 @@
+// This file is part of Moonfire NVR, a security camera network video recorder.
+// Copyright (C) 2023 The Moonfire NVR Authors; see AUTHORS and LICENSE.txt.
+// SPDX-License-Identifier: GPL-v3.0-or-later WITH GPL-3.0-linking-exception
+
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    environment: "jsdom",
+    globals: true,
+    setupFiles: ["./src/setupTests.ts"],
+  },
+});