test: establish frontend gate taxonomy

vitest.config.js

@@ -0,0 +1,15 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    globals: false,
+    setupFiles: ["./tests/setup.js"],
+    restoreMocks: true,
+    clearMocks: true,
+    mockReset: true,
+    testTimeout: 10_000,
+    coverage: {
+      reporter: ["text", "json-summary"],
+    },
+  },
+});