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/jest-pnp-resolver/createRequire.js

@@ -0,0 +1,25 @@
+const nativeModule = require(`module`);
+
+module.exports = (filename) => {
+  // Added in Node v12.2.0
+  if (nativeModule.createRequire) {
+    return nativeModule.createRequire(filename);
+  }
+
+  // Added in Node v10.12.0 and deprecated since Node v12.2.0
+  if (nativeModule.createRequireFromPath) {
+    return nativeModule.createRequireFromPath(filename);
+  }
+
+  // Polyfill
+  return _createRequire(filename);
+};
+
+// Polyfill
+function _createRequire (filename) {
+  const mod = new nativeModule.Module(filename, null)
+  mod.filename = filename
+  mod.paths = nativeModule.Module._nodeModulePaths(path.dirname(filename))
+  mod._compile(`module.exports = require;`, filename)
+  return mod.exports
+}