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/yargs-parser/browser.js

@@ -0,0 +1,29 @@
+// Main entrypoint for ESM web browser environments. Avoids using Node.js
+// specific libraries, such as "path".
+//
+// TODO: figure out reasonable web equivalents for "resolve", "normalize", etc.
+import { camelCase, decamelize, looksLikeNumber } from './build/lib/string-utils.js'
+import { YargsParser } from './build/lib/yargs-parser.js'
+const parser = new YargsParser({
+  cwd: () => { return '' },
+  format: (str, arg) => { return str.replace('%s', arg) },
+  normalize: (str) => { return str },
+  resolve: (str) => { return str },
+  require: () => {
+    throw Error('loading config from files not currently supported in browser')
+  },
+  env: () => {}
+})
+
+const yargsParser = function Parser (args, opts) {
+  const result = parser.parse(args.slice(), opts)
+  return result.argv
+}
+yargsParser.detailed = function (args, opts) {
+  return parser.parse(args.slice(), opts)
+}
+yargsParser.camelCase = camelCase
+yargsParser.decamelize = decamelize
+yargsParser.looksLikeNumber = looksLikeNumber
+
+export default yargsParser