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/cliui/build/lib/string-utils.js

@@ -0,0 +1,27 @@
+// Minimal replacement for ansi string helpers "wrap-ansi" and "strip-ansi".
+// to facilitate ESM and Deno modules.
+// TODO: look at porting https://www.npmjs.com/package/wrap-ansi to ESM.
+// The npm application
+// Copyright (c) npm, Inc. and Contributors
+// Licensed on the terms of The Artistic License 2.0
+// See: https://github.com/npm/cli/blob/4c65cd952bc8627811735bea76b9b110cc4fc80e/lib/utils/ansi-trim.js
+const ansi = new RegExp('\x1b(?:\\[(?:\\d+[ABCDEFGJKSTm]|\\d+;\\d+[Hfm]|' +
+    '\\d+;\\d+;\\d+m|6n|s|u|\\?25[lh])|\\w)', 'g');
+export function stripAnsi(str) {
+    return str.replace(ansi, '');
+}
+export function wrap(str, width) {
+    const [start, end] = str.match(ansi) || ['', ''];
+    str = stripAnsi(str);
+    let wrapped = '';
+    for (let i = 0; i < str.length; i++) {
+        if (i !== 0 && (i % width) === 0) {
+            wrapped += '\n';
+        }
+        wrapped += str.charAt(i);
+    }
+    if (start && end) {
+        wrapped = `${start}${wrapped}${end}`;
+    }
+    return wrapped;
+}