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/tough-cookie/dist/validators.js

@@ -0,0 +1,90 @@
+"use strict";
+/* ************************************************************************************
+Extracted from check-types.js
+https://gitlab.com/philbooth/check-types.js
+
+MIT License
+
+Copyright (c) 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 Phil Booth
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+************************************************************************************ */
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.ParameterError = void 0;
+exports.isNonEmptyString = isNonEmptyString;
+exports.isDate = isDate;
+exports.isEmptyString = isEmptyString;
+exports.isString = isString;
+exports.isObject = isObject;
+exports.isInteger = isInteger;
+exports.validate = validate;
+const utils_1 = require("./utils");
+/* Validation functions copied from check-types package - https://www.npmjs.com/package/check-types */
+/** Determines whether the argument is a non-empty string. */
+function isNonEmptyString(data) {
+    return isString(data) && data !== '';
+}
+/** Determines whether the argument is a *valid* Date. */
+function isDate(data) {
+    return data instanceof Date && isInteger(data.getTime());
+}
+/** Determines whether the argument is the empty string. */
+function isEmptyString(data) {
+    return data === '' || (data instanceof String && data.toString() === '');
+}
+/** Determines whether the argument is a string. */
+function isString(data) {
+    return typeof data === 'string' || data instanceof String;
+}
+/** Determines whether the string representation of the argument is "[object Object]". */
+function isObject(data) {
+    return (0, utils_1.objectToString)(data) === '[object Object]';
+}
+/** Determines whether the argument is an integer. */
+function isInteger(data) {
+    return typeof data === 'number' && data % 1 === 0;
+}
+/* -- End validation functions -- */
+/**
+ * When the first argument is false, an error is created with the given message. If a callback is
+ * provided, the error is passed to the callback, otherwise the error is thrown.
+ */
+function validate(bool, cbOrMessage, message) {
+    if (bool)
+        return; // Validation passes
+    const cb = typeof cbOrMessage === 'function' ? cbOrMessage : undefined;
+    let options = typeof cbOrMessage === 'function' ? message : cbOrMessage;
+    // The default message prior to v5 was '[object Object]' due to a bug, and the message is kept
+    // for backwards compatibility.
+    if (!isObject(options))
+        options = '[object Object]';
+    const err = new ParameterError((0, utils_1.safeToString)(options));
+    if (cb)
+        cb(err);
+    else
+        throw err;
+}
+/**
+ * Represents a validation error.
+ * @public
+ */
+class ParameterError extends Error {
+}
+exports.ParameterError = ParameterError;