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/@testing-library/user-event/dist/esm/clipboard/cut.js

@@ -0,0 +1,20 @@
+import { writeDataTransferToClipboard } from '../utils/dataTransfer/Clipboard.js';
+import { copySelection } from '../document/copySelection.js';
+
+async function cut() {
+    const doc = this.config.document;
+    var _doc_activeElement;
+    const target = (_doc_activeElement = doc.activeElement) !== null && _doc_activeElement !== undefined ? _doc_activeElement : /* istanbul ignore next */ doc.body;
+    const clipboardData = copySelection(target);
+    if (clipboardData.items.length === 0) {
+        return;
+    }
+    if (this.dispatchUIEvent(target, 'cut', {
+        clipboardData
+    }) && this.config.writeToClipboard) {
+        await writeDataTransferToClipboard(target.ownerDocument, clipboardData);
+    }
+    return clipboardData;
+}
+
+export { cut };