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-jsdom-abstract/build/index.d.ts

@@ -0,0 +1,47 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import {Context} from 'vm';
+import * as jsdom from 'jsdom';
+import {
+  EnvironmentContext,
+  JestEnvironment,
+  JestEnvironmentConfig,
+} from '@jest/environment';
+import {LegacyFakeTimers, ModernFakeTimers} from '@jest/fake-timers';
+import {Global as Global_2} from '@jest/types';
+import {ModuleMocker} from 'jest-mock';
+
+declare abstract class BaseJSDOMEnvironment implements JestEnvironment<number> {
+  dom: jsdom.JSDOM | null;
+  fakeTimers: LegacyFakeTimers<number> | null;
+  fakeTimersModern: ModernFakeTimers | null;
+  global: Win;
+  private errorEventListener;
+  moduleMocker: ModuleMocker | null;
+  customExportConditions: Array<string>;
+  private readonly _configuredExportConditions?;
+  protected constructor(
+    config: JestEnvironmentConfig,
+    context: EnvironmentContext,
+    jsdomModule: typeof jsdom,
+  );
+  setup(): Promise<void>;
+  teardown(): Promise<void>;
+  exportConditions(): Array<string>;
+  getVmContext(): Context | null;
+}
+export default BaseJSDOMEnvironment;
+
+declare type Win = Window &
+  Global_2.Global & {
+    Error: {
+      stackTraceLimit: number;
+    };
+  };
+
+export {};