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-indent/index.d.ts

@@ -0,0 +1,21 @@
+/**
+Strip leading whitespace from each line in a string.
+
+The line with the least number of leading whitespace, ignoring empty lines, determines the number to remove.
+
+@example
+```
+import stripIndent = require('strip-indent');
+
+const string = '\tunicorn\n\t\tcake';
+//	unicorn
+//		cake
+
+stripIndent(string);
+//unicorn
+//	cake
+```
+*/
+declare function stripIndent(string: string): string;
+
+export = stripIndent;