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/cjs/index.js

@@ -0,0 +1,65 @@
+'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);
+}
+exports.escape = escape;
+
+function unescape(un) {
+  return replace.call(un, es, cape);
+}
+exports.unescape = unescape;
+
+function pe(m) {
+  return esca[m];
+}
+
+function cape(m) {
+  return unes[m];
+}