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-circus/build/jestAdapterInit.d.mts

@@ -0,0 +1,51 @@
+import { JestExpect } from "@jest/expect";
+import { TestFileEvent, TestResult } from "@jest/test-result";
+import { SnapshotState } from "jest-snapshot";
+import * as Process from "process";
+import { JestEnvironment } from "@jest/environment";
+import { Circus, Config, Global } from "@jest/types";
+import Runtime from "jest-runtime";
+
+//#region src/legacy-code-todo-rewrite/jestAdapterInit.d.ts
+
+interface RuntimeGlobals extends Global.TestFrameworkGlobals {
+  expect: JestExpect;
+}
+declare const initialize: ({
+  config,
+  environment,
+  runtime,
+  globalConfig,
+  localRequire,
+  parentProcess,
+  sendMessageToJest,
+  setGlobalsForRuntime,
+  testPath
+}: {
+  config: Config.ProjectConfig;
+  environment: JestEnvironment;
+  runtime: Runtime;
+  globalConfig: Config.GlobalConfig;
+  localRequire: <T = unknown>(path: string) => T;
+  testPath: string;
+  parentProcess: typeof Process;
+  sendMessageToJest?: TestFileEvent;
+  setGlobalsForRuntime: (globals: RuntimeGlobals) => void;
+}) => Promise<{
+  globals: Global.TestFrameworkGlobals;
+  snapshotState: SnapshotState;
+}>;
+declare const runAndTransformResultsToJestFormat: ({
+  config,
+  globalConfig,
+  setupAfterEnvPerfStats,
+  testPath
+}: {
+  config: Config.ProjectConfig;
+  globalConfig: Config.GlobalConfig;
+  testPath: string;
+  setupAfterEnvPerfStats: Config.SetupAfterEnvPerfStats;
+}) => Promise<TestResult>;
+declare const eventHandler: (event: Circus.Event) => Promise<void>;
+//#endregion
+export { eventHandler, initialize, runAndTransformResultsToJestFormat };