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/istanbul-lib-source-maps/README.md

@@ -0,0 +1,10 @@
+# istanbul-lib-source-maps
+
+[![Build Status](https://img.shields.io/github/actions/workflow/status/istanbuljs/istanbuljs/ci.yml?label=CI&logo=GitHub)](https://github.com/istanbuljs/istanbuljs/actions/workflows/ci.yml)
+
+Source map support for istanbuljs.
+
+## Debugging
+
+`istanbul-lib-source-maps` uses the [debug](https://www.npmjs.com/package/debug) module. Run your application with the environment variable `DEBUG=istanbuljs`, to receive debug
+output.