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-coverage/README.md

@@ -0,0 +1,29 @@
+## istanbul-lib-coverage
+
+[![Greenkeeper badge](https://badges.greenkeeper.io/istanbuljs/istanbul-lib-coverage.svg)](https://greenkeeper.io/)
+[![Build Status](https://travis-ci.org/istanbuljs/istanbul-lib-coverage.svg?branch=master)](https://travis-ci.org/istanbuljs/istanbul-lib-coverage)
+
+An API that provides a read-only view of coverage information with the ability
+to merge and summarize coverage info.
+
+Supersedes `object-utils` and `collector` from the v0 istanbul API.
+
+See the docs for the full API.
+
+```js
+var libCoverage = require('istanbul-lib-coverage');
+var map = libCoverage.createCoverageMap(globalCoverageVar);
+var summary = libCoverage.createCoverageSummary();
+
+// merge another coverage map into the one we created
+map.merge(otherCoverageMap);
+
+// inspect and summarize all file coverage objects in the map
+map.files().forEach(function(f) {
+    var fc = map.fileCoverageFor(f),
+        s = fc.toSummary();
+    summary.merge(s);
+});
+
+console.log('Global summary', summary);
+```