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/strip-final-newline/readme.md

@@ -0,0 +1,30 @@
+# strip-final-newline [![Build Status](https://travis-ci.com/sindresorhus/strip-final-newline.svg?branch=master)](https://travis-ci.com/sindresorhus/strip-final-newline)
+
+> Strip the final [newline character](https://en.wikipedia.org/wiki/Newline) from a string/buffer
+
+Can be useful when parsing the output of, for example, `ChildProcess#execFile`, as [binaries usually output a newline at the end](https://stackoverflow.com/questions/729692/why-should-text-files-end-with-a-newline). Normally, you would use `stdout.trim()`, but that would also remove newlines at the start and whitespace.
+
+
+## Install
+
+```
+$ npm install strip-final-newline
+```
+
+
+## Usage
+
+```js
+const stripFinalNewline = require('strip-final-newline');
+
+stripFinalNewline('foo\nbar\n\n');
+//=> 'foo\nbar\n'
+
+stripFinalNewline(Buffer.from('foo\nbar\n\n')).toString();
+//=> 'foo\nbar\n'
+```
+
+
+## License
+
+MIT © [Sindre Sorhus](https://sindresorhus.com)