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/jest-transform-stub/README.md

@@ -0,0 +1,42 @@
+# jest-transform-stub
+
+Jest doesn't handle non JavaScript assets by default.
+
+You can use this module to avoid errors when importing non JavaScript assets.
+
+## Usage
+
+```shell
+npm install --save-dev jest-transform-stub
+```
+
+In your Jest config, add jest-transform-stub to transform non JavaScript assets you want to stub:
+
+```js
+{
+  "jest": {
+    // ..
+    "transform": {
+      "^.+\\.js$": "babel-jest",
+      ".+\\.(css|styl|less|sass|scss|png|jpg|ttf|woff|woff2)$": "jest-transform-stub"
+    }
+  }
+}
+```
+
+## FAQ
+
+**My module isn't being transformed**
+
+Jest doesn't apply transforms to node_modules by default. You can solve this by using `moduleNameMapper`:
+
+```js
+{
+  "jest": {
+    // ..
+    "moduleNameMapper": {
+      "^.+.(css|styl|less|sass|scss|png|jpg|ttf|woff|woff2)$": "jest-transform-stub"
+    }
+  }
+}
+```