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/tough-cookie/dist/cookie/formatDate.d.ts

@@ -0,0 +1,15 @@
+/**
+ * Format a {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date | Date} into
+ * the {@link https://www.rfc-editor.org/rfc/rfc2616#section-3.3.1 | preferred Internet standard format}
+ * defined in {@link https://www.rfc-editor.org/rfc/rfc822#section-5 | RFC822} and
+ * updated in {@link https://www.rfc-editor.org/rfc/rfc1123#page-55 | RFC1123}.
+ *
+ * @example
+ * ```
+ * formatDate(new Date(0)) === 'Thu, 01 Jan 1970 00:00:00 GMT`
+ * ```
+ *
+ * @param date - the date value to format
+ * @public
+ */
+export declare function formatDate(date: Date): string;