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/CSSSupportsRule.js

@@ -0,0 +1,36 @@
+//.CommonJS
+var CSSOM = {
+  CSSRule: require("./CSSRule").CSSRule,
+  CSSGroupingRule: require("./CSSGroupingRule").CSSGroupingRule,
+  CSSConditionRule: require("./CSSConditionRule").CSSConditionRule
+};
+///CommonJS
+
+
+/**
+ * @constructor
+ * @see https://drafts.csswg.org/css-conditional-3/#the-csssupportsrule-interface
+ */
+CSSOM.CSSSupportsRule = function CSSSupportsRule() {
+  CSSOM.CSSConditionRule.call(this);
+};
+
+CSSOM.CSSSupportsRule.prototype = new CSSOM.CSSConditionRule();
+CSSOM.CSSSupportsRule.prototype.constructor = CSSOM.CSSSupportsRule;
+CSSOM.CSSSupportsRule.prototype.type = 12;
+
+Object.defineProperty(CSSOM.CSSSupportsRule.prototype, "cssText", {
+  get: function() {
+    var cssTexts = [];
+
+    for (var i = 0, length = this.cssRules.length; i < length; i++) {
+      cssTexts.push(this.cssRules[i].cssText);
+    }
+
+    return "@supports " + this.conditionText + " {" + cssTexts.join("") + "}";
+  }
+});
+
+//.CommonJS
+exports.CSSSupportsRule = CSSOM.CSSSupportsRule;
+///CommonJS