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/babel-plugin-istanbul/lib/load-nyc-config-sync.js

@@ -0,0 +1,18 @@
+#!/usr/bin/env node
+'use strict';
+
+const {
+  loadNycConfig
+} = require('@istanbuljs/load-nyc-config');
+async function main() {
+  const [cwd, nycrcPath] = process.argv.slice(2);
+  console.log(JSON.stringify(await loadNycConfig({
+    cwd,
+    nycrcPath
+  })));
+}
+main().catch(error => {
+  console.log(JSON.stringify({
+    'load-nyc-config-sync-error': error.message
+  }));
+});