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-reports/README.md

@@ -0,0 +1,13 @@
+# istanbul-reports
+
+[![Greenkeeper badge](https://badges.greenkeeper.io/istanbuljs/istanbul-reports.svg)](https://greenkeeper.io/)
+[![Build Status](https://travis-ci.org/istanbuljs/istanbul-reports.svg?branch=main)](https://travis-ci.org/istanbuljs/istanbul-reports)
+
+-   node.getRelativeName
+
+-   context.getSource(filePath)
+-   context.classForPercent(type, percent)
+-   context.console.colorize(str, class)
+-   context.writer
+-   context.console.write
+-   context.console.println