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/napi-postinstall/lib/helpers.d.ts

@@ -0,0 +1,13 @@
+import type { NapiInfo, PackageJson } from './types.js';
+export declare function getGlobalNpmRegistry(): string;
+export declare function removeRecursive(dir: string): void;
+export declare function downloadedNodePath(name: string, subpath: string): string;
+export declare function getNapiInfoFromPackageJson(packageJson: PackageJson, checkVersion: true): NapiInfo & {
+    version: string;
+};
+export declare function getNapiInfoFromPackageJson(packageJson: PackageJson, checkVersion?: boolean): NapiInfo;
+export declare function getNapiNativeTarget(): string[] | string;
+export declare function getNapiNativeTargets(): string[];
+export declare function getErrorMessage(err: unknown): string;
+export declare function errorLog(message: string, ...args: unknown[]): void;
+export declare function errorMessage(message: string, extra?: string): string;