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/make-error/index.d.ts

@@ -0,0 +1,47 @@
+/**
+ * Create a new error constructor instance.
+ */
+declare function makeError(
+  name: string
+): makeError.Constructor<makeError.BaseError>;
+
+/**
+ * Set the constructor prototype to `BaseError`.
+ */
+declare function makeError<T extends Error>(super_: {
+  new (...args: any[]): T;
+}): makeError.Constructor<T & makeError.BaseError>;
+
+/**
+ * Create a specialized error instance.
+ */
+declare function makeError<T extends Error, K>(
+  name: string | Function,
+  super_: K
+): K & makeError.SpecializedConstructor<T>;
+
+declare namespace makeError {
+  /**
+   * Use with ES2015+ inheritance.
+   */
+  export class BaseError extends Error {
+    message: string;
+    name: string;
+    stack: string;
+
+    constructor(message?: string);
+  }
+
+  export interface Constructor<T> {
+    new (message?: string): T;
+    super_: any;
+    prototype: T;
+  }
+
+  export interface SpecializedConstructor<T> {
+    super_: any;
+    prototype: T;
+  }
+}
+
+export = makeError;