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-environment-node/build/index.d.mts

@@ -0,0 +1,31 @@
+import { Context } from "vm";
+import { LegacyFakeTimers, ModernFakeTimers } from "@jest/fake-timers";
+import { ModuleMocker } from "jest-mock";
+import { EnvironmentContext, JestEnvironment, JestEnvironmentConfig } from "@jest/environment";
+import { Global } from "@jest/types";
+
+//#region src/index.d.ts
+
+type Timer = {
+  id: number;
+  ref: () => Timer;
+  unref: () => Timer;
+};
+declare class NodeEnvironment implements JestEnvironment<Timer> {
+  context: Context | null;
+  fakeTimers: LegacyFakeTimers<Timer> | null;
+  fakeTimersModern: ModernFakeTimers | null;
+  global: Global.Global;
+  moduleMocker: ModuleMocker | null;
+  customExportConditions: string[];
+  private readonly _configuredExportConditions?;
+  private _globalProxy;
+  constructor(config: JestEnvironmentConfig, _context: EnvironmentContext);
+  setup(): Promise<void>;
+  teardown(): Promise<void>;
+  exportConditions(): Array<string>;
+  getVmContext(): Context | null;
+}
+declare const TestEnvironment: typeof NodeEnvironment;
+//#endregion
+export { TestEnvironment, NodeEnvironment as default };