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/dom-accessibility-api/dist/polyfills/SetLike.js

@@ -0,0 +1,65 @@
+"use strict";
+
+exports.__esModule = true;
+exports.default = void 0;
+function _typeof(obj) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (obj) { return typeof obj; } : function (obj) { return obj && "function" == typeof Symbol && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }, _typeof(obj); }
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
+function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+function _toPropertyKey(arg) { var key = _toPrimitive(arg, "string"); return _typeof(key) === "symbol" ? key : String(key); }
+function _toPrimitive(input, hint) { if (_typeof(input) !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (_typeof(res) !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
+// for environments without Set we fallback to arrays with unique members
+var SetLike = /*#__PURE__*/function () {
+  function SetLike() {
+    var items = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [];
+    _classCallCheck(this, SetLike);
+    _defineProperty(this, "items", void 0);
+    this.items = items;
+  }
+  _createClass(SetLike, [{
+    key: "add",
+    value: function add(value) {
+      if (this.has(value) === false) {
+        this.items.push(value);
+      }
+      return this;
+    }
+  }, {
+    key: "clear",
+    value: function clear() {
+      this.items = [];
+    }
+  }, {
+    key: "delete",
+    value: function _delete(value) {
+      var previousLength = this.items.length;
+      this.items = this.items.filter(function (item) {
+        return item !== value;
+      });
+      return previousLength !== this.items.length;
+    }
+  }, {
+    key: "forEach",
+    value: function forEach(callbackfn) {
+      var _this = this;
+      this.items.forEach(function (item) {
+        callbackfn(item, item, _this);
+      });
+    }
+  }, {
+    key: "has",
+    value: function has(value) {
+      return this.items.indexOf(value) !== -1;
+    }
+  }, {
+    key: "size",
+    get: function get() {
+      return this.items.length;
+    }
+  }]);
+  return SetLike;
+}();
+var _default = typeof Set === "undefined" ? Set : SetLike;
+exports.default = _default;
+//# sourceMappingURL=SetLike.js.map