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/lib/lcov/index.js

@@ -0,0 +1,33 @@
+'use strict';
+/*
+ Copyright 2012-2015, Yahoo Inc.
+ Copyrights licensed under the New BSD License. See the accompanying LICENSE file for terms.
+ */
+const { ReportBase } = require('istanbul-lib-report');
+const LcovOnlyReport = require('../lcovonly');
+const HtmlReport = require('../html');
+
+class LcovReport extends ReportBase {
+    constructor(opts) {
+        super();
+        this.lcov = new LcovOnlyReport({ file: 'lcov.info', ...opts });
+        this.html = new HtmlReport({ subdir: 'lcov-report' });
+    }
+}
+
+['Start', 'End', 'Summary', 'SummaryEnd', 'Detail'].forEach(what => {
+    const meth = 'on' + what;
+    LcovReport.prototype[meth] = function(...args) {
+        const lcov = this.lcov;
+        const html = this.html;
+
+        if (lcov[meth]) {
+            lcov[meth](...args);
+        }
+        if (html[meth]) {
+            html[meth](...args);
+        }
+    };
+});
+
+module.exports = LcovReport;