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/html-escaper/index.js

@@ -0,0 +1,70 @@
+var html = (function (exports) {
+  'use strict';
+
+  /**
+   * Copyright (C) 2017-present by Andrea Giammarchi - @WebReflection
+   *
+   * 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.
+   */
+
+  var replace = ''.replace;
+
+  var ca = /[&<>'"]/g;
+  var es = /&(?:amp|#38|lt|#60|gt|#62|apos|#39|quot|#34);/g;
+
+  var esca = {
+    '&': '&amp;',
+    '<': '&lt;',
+    '>': '&gt;',
+    "'": '&#39;',
+    '"': '&quot;'
+  };
+  var unes = {
+    '&amp;': '&',
+    '&#38;': '&',
+    '&lt;': '<',
+    '&#60;': '<',
+    '&gt;': '>',
+    '&#62;': '>',
+    '&apos;': "'",
+    '&#39;': "'",
+    '&quot;': '"',
+    '&#34;': '"'
+  };
+
+  function escape(es) {
+    return replace.call(es, ca, pe);
+  }
+  function unescape(un) {
+    return replace.call(un, es, cape);
+  }
+  function pe(m) {
+    return esca[m];
+  }
+
+  function cape(m) {
+    return unes[m];
+  }
+
+  exports.escape = escape;
+  exports.unescape = unescape;
+
+  return exports;
+
+}({}));