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/whatwg-url/lib/VoidFunction.js

@@ -0,0 +1,26 @@
+"use strict";
+
+const conversions = require("webidl-conversions");
+const utils = require("./utils.js");
+
+exports.convert = (globalObject, value, { context = "The provided value" } = {}) => {
+  if (typeof value !== "function") {
+    throw new globalObject.TypeError(context + " is not a function");
+  }
+
+  function invokeTheCallbackFunction() {
+    const thisArg = utils.tryWrapperForImpl(this);
+    let callResult;
+
+    callResult = Reflect.apply(value, thisArg, []);
+  }
+
+  invokeTheCallbackFunction.construct = () => {
+    let callResult = Reflect.construct(value, []);
+  };
+
+  invokeTheCallbackFunction[utils.wrapperSymbol] = value;
+  invokeTheCallbackFunction.objectReference = value;
+
+  return invokeTheCallbackFunction;
+};