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/@sinonjs/commons/lib/called-in-order.js

@@ -0,0 +1,55 @@
+"use strict";
+
+var every = require("./prototypes/array").every;
+
+/**
+ * @private
+ */
+function hasCallsLeft(callMap, spy) {
+    if (callMap[spy.id] === undefined) {
+        callMap[spy.id] = 0;
+    }
+
+    return callMap[spy.id] < spy.callCount;
+}
+
+/**
+ * @private
+ */
+function checkAdjacentCalls(callMap, spy, index, spies) {
+    var calledBeforeNext = true;
+
+    if (index !== spies.length - 1) {
+        calledBeforeNext = spy.calledBefore(spies[index + 1]);
+    }
+
+    if (hasCallsLeft(callMap, spy) && calledBeforeNext) {
+        callMap[spy.id] += 1;
+        return true;
+    }
+
+    return false;
+}
+
+/**
+ * A Sinon proxy object (fake, spy, stub)
+ * @typedef {object} SinonProxy
+ * @property {Function} calledBefore - A method that determines if this proxy was called before another one
+ * @property {string} id - Some id
+ * @property {number} callCount - Number of times this proxy has been called
+ */
+
+/**
+ * Returns true when the spies have been called in the order they were supplied in
+ * @param  {SinonProxy[] | SinonProxy} spies An array of proxies, or several proxies as arguments
+ * @returns {boolean} true when spies are called in order, false otherwise
+ */
+function calledInOrder(spies) {
+    var callMap = {};
+    // eslint-disable-next-line no-underscore-dangle
+    var _spies = arguments.length > 1 ? arguments : spies;
+
+    return every(_spies, checkAdjacentCalls.bind(null, callMap));
+}
+
+module.exports = calledInOrder;