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/permutePath.d.ts

@@ -0,0 +1,14 @@
+/**
+ * Generates the permutation of all possible values that {@link pathMatch} the `path` parameter.
+ * The array is in longest-to-shortest order.  Useful when building custom {@link Store} implementations.
+ *
+ * @example
+ * ```
+ * permutePath('/foo/bar/')
+ * // ['/foo/bar/', '/foo/bar', '/foo', '/']
+ * ```
+ *
+ * @param path - the path to generate permutations for
+ * @public
+ */
+export declare function permutePath(path: string): string[];