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/rrweb-cssom/lib/CSSContainerRule.js

@@ -0,0 +1,50 @@
+//.CommonJS
+var CSSOM = {
+	CSSRule: require("./CSSRule").CSSRule,
+	CSSGroupingRule: require("./CSSGroupingRule").CSSGroupingRule,
+	CSSConditionRule: require("./CSSConditionRule").CSSConditionRule,
+};
+///CommonJS
+
+
+/**
+ * @constructor
+ * @see https://drafts.csswg.org/css-contain-3/
+ * @see https://www.w3.org/TR/css-contain-3/
+ */
+CSSOM.CSSContainerRule = function CSSContainerRule() {
+	CSSOM.CSSConditionRule.call(this);
+};
+
+CSSOM.CSSContainerRule.prototype = new CSSOM.CSSConditionRule();
+CSSOM.CSSContainerRule.prototype.constructor = CSSOM.CSSContainerRule;
+CSSOM.CSSContainerRule.prototype.type = 17;
+
+Object.defineProperties(CSSOM.CSSContainerRule.prototype, {
+  "conditionText": {
+    get: function() {
+      return this.containerText;
+    },
+    set: function(value) {
+      this.containerText = value;
+    },
+    configurable: true,
+    enumerable: true
+  },
+  "cssText": {
+    get: function() {
+      var cssTexts = [];
+      for (var i=0, length=this.cssRules.length; i < length; i++) {
+        cssTexts.push(this.cssRules[i].cssText);
+      }
+      return "@container " + this.containerText + " {" + cssTexts.join("") + "}";
+    },
+    configurable: true,
+    enumerable: true
+  }
+});
+
+
+//.CommonJS
+exports.CSSContainerRule = CSSOM.CSSContainerRule;
+///CommonJS