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/leven/index.d.ts

@@ -0,0 +1,21 @@
+declare const leven: {
+	/**
+	Measure the difference between two strings.
+
+	@example
+	```
+	import leven = require('leven');
+
+	leven('cat', 'cow');
+	//=> 2
+	```
+	*/
+	(left: string, right: string): number;
+
+	// TODO: Remove this for the next major release, refactor the whole definition to:
+	// declare function leven(left: string, right: string): number;
+	// export = leven;
+	default: typeof leven;
+};
+
+export = leven;