add vitest and regression tests for arc 1

vitest.config.ts

@@ -0,0 +1,10 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    environment: "jsdom",
+    globals: true,
+    setupFiles: "./src/test/setup.ts",
+    include: ["src/**/*.test.ts", "src/**/*.test.tsx"],
+  },
+});