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/cssstyle/README.md

@@ -0,0 +1,11 @@
+# CSSStyleDeclaration
+
+A Node.js implementation of the CSS Object Model [`CSSStyleDeclaration` class](https://drafts.csswg.org/cssom/#the-cssstyledeclaration-interface).
+
+## Background
+
+This package is an extension of the `CSSStyleDeclaration` class in Nikita Vasilyev's [CSSOM](https://github.com/NV/CSSOM), with added support for modern specifications. The primary use case is for testing browser code in a Node environment.
+
+It was originally created by Chad Walker, it is now maintained by the jsdom community.
+
+Bug reports and pull requests are welcome.