Set up comprehensive frontend testing infrastructure

- Install Jest for unit testing with React Testing Library
- Install Playwright for end-to-end testing
- Configure Jest with proper TypeScript support and module mapping
- Create test setup files and utilities for both unit and e2e tests

Components:
* Jest configuration with coverage thresholds
* Playwright configuration with browser automation
* Unit tests for LoginForm, AuthContext, and useSocketIO hook
* E2E tests for authentication, dashboard, and agents workflows
* GitHub Actions workflow for automated testing
* Mock data and API utilities for consistent testing
* Test documentation with best practices

Testing features:
- Unit tests with 70% coverage threshold
- E2E tests with API mocking and user journey testing
- CI/CD integration for automated test runs
- Cross-browser testing support with Playwright
- Authentication system testing end-to-end

🚀 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/node_modules/@jest/snapshot-utils/build/index.d.mts

@@ -0,0 +1,29 @@
+import { Config } from "@jest/types";
+
+//#region src/types.d.ts
+
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+type SnapshotData = Record<string, string>;
+//#endregion
+//#region src/utils.d.ts
+
+declare const SNAPSHOT_VERSION = "1";
+declare const SNAPSHOT_GUIDE_LINK = "https://jestjs.io/docs/snapshot-testing";
+declare const SNAPSHOT_VERSION_WARNING: string;
+declare const testNameToKey: (testName: string, count: number) => string;
+declare const keyToTestName: (key: string) => string;
+declare const getSnapshotData: (snapshotPath: string, update: Config.SnapshotUpdateState) => {
+  data: SnapshotData;
+  dirty: boolean;
+};
+declare const escapeBacktickString: (str: string) => string;
+declare const ensureDirectoryExists: (filePath: string) => void;
+declare const normalizeNewlines: (string: string) => string;
+declare const saveSnapshotFile: (snapshotData: SnapshotData, snapshotPath: string) => void;
+//#endregion
+export { SNAPSHOT_GUIDE_LINK, SNAPSHOT_VERSION, SNAPSHOT_VERSION_WARNING, SnapshotData, ensureDirectoryExists, escapeBacktickString, getSnapshotData, keyToTestName, normalizeNewlines, saveSnapshotFile, testNameToKey };