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/redent/index.d.ts

@@ -0,0 +1,27 @@
+import {Options as IndentStringOptions} from 'indent-string';
+
+declare namespace redent {
+	type Options = IndentStringOptions;
+}
+
+/**
+[Strip redundant indentation](https://github.com/sindresorhus/strip-indent) and [indent the string](https://github.com/sindresorhus/indent-string).
+
+@param string - The string to normalize indentation.
+@param count - How many times you want `options.indent` repeated. Default: `0`.
+
+@example
+```
+import redent = require('redent');
+
+redent('\n  foo\n    bar\n', 1);
+//=> '\n foo\n   bar\n'
+```
+*/
+declare function redent(
+	string: string,
+	count?: number,
+	options?: redent.Options
+): string;
+
+export = redent;