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/LICENSE

@@ -0,0 +1,19 @@
+Copyright (c) 2018 Edd Yerburgh
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

frontend/node_modules/jest-transform-stub/README.md

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+# 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"
+    }
+  }
+}
+```

frontend/node_modules/jest-transform-stub/index.js

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+module.exports = {
+  process: function() {
+    return {
+      code: 'module.exports = ""'
+    }
+  }
+}

frontend/node_modules/jest-transform-stub/package.json

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+{
+  "name": "jest-transform-stub",
+  "version": "2.0.0",
+  "description": "Jest transform stub",
+  "main": "index.js",
+  "files": [
+    "index.js"
+  ],
+  "scripts": {
+    "test": "jest"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/eddyerburgh/jest-transform-stub.git"
+  },
+  "keywords": [
+    "jest"
+  ],
+  "author": "Edd Yerburgh",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/eddyerburgh/jest-transform-stub/issues"
+  },
+  "homepage": "https://github.com/eddyerburgh/jest-transform-stub#readme",
+  "devDependencies": {
+    "jest": "^22.4.2"
+  },
+  "jest": {
+    "transform": {
+      ".+\\.png$": "<rootDir>/index.js"
+    }
+  }
+}