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/pathMatch.d.ts

@@ -0,0 +1,17 @@
+/**
+ * Answers "does the request-path path-match a given cookie-path?" as per {@link https://www.rfc-editor.org/rfc/rfc6265.html#section-5.1.4 | RFC6265 Section 5.1.4}.
+ * This is essentially a prefix-match where cookiePath is a prefix of reqPath.
+ *
+ * @remarks
+ * A request-path path-matches a given cookie-path if at least one of
+ * the following conditions holds:
+ *
+ * - The cookie-path and the request-path are identical.
+ * - The cookie-path is a prefix of the request-path, and the last character of the cookie-path is %x2F ("/").
+ * - The cookie-path is a prefix of the request-path, and the first character of the request-path that is not included in the cookie-path is a %x2F ("/") character.
+ *
+ * @param reqPath - the path of the request
+ * @param cookiePath - the path of the cookie
+ * @public
+ */
+export declare function pathMatch(reqPath: string, cookiePath: string): boolean;