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/CSSGroupingRule.js

@@ -0,0 +1,69 @@
+//.CommonJS
+var CSSOM = {
+	CSSRule: require("./CSSRule").CSSRule,
+	parse: require('./parse').parse
+};
+///CommonJS
+
+
+/**
+ * @constructor
+ * @see https://drafts.csswg.org/cssom/#the-cssgroupingrule-interface
+ */
+CSSOM.CSSGroupingRule = function CSSGroupingRule() {
+	CSSOM.CSSRule.call(this);
+	this.cssRules = [];
+};
+
+CSSOM.CSSGroupingRule.prototype = new CSSOM.CSSRule();
+CSSOM.CSSGroupingRule.prototype.constructor = CSSOM.CSSGroupingRule;
+
+
+/**
+ * Used to insert a new CSS rule to a list of CSS rules.
+ *
+ * @example
+ *   cssGroupingRule.cssText
+ *   -> "body{margin:0;}"
+ *   cssGroupingRule.insertRule("img{border:none;}", 1)
+ *   -> 1
+ *   cssGroupingRule.cssText
+ *   -> "body{margin:0;}img{border:none;}"
+ *
+ * @param {string} rule
+ * @param {number} [index]
+ * @see https://www.w3.org/TR/cssom-1/#dom-cssgroupingrule-insertrule
+ * @return {number} The index within the grouping rule's collection of the newly inserted rule.
+ */
+ CSSOM.CSSGroupingRule.prototype.insertRule = function insertRule(rule, index) {
+	if (index < 0 || index > this.cssRules.length) {
+		throw new RangeError("INDEX_SIZE_ERR");
+	}
+	var cssRule = CSSOM.parse(rule).cssRules[0];
+	cssRule.parentRule = this;
+	this.cssRules.splice(index, 0, cssRule);
+	return index;
+};
+
+/**
+ * Used to delete a rule from the grouping rule.
+ *
+ *   cssGroupingRule.cssText
+ *   -> "img{border:none;}body{margin:0;}"
+ *   cssGroupingRule.deleteRule(0)
+ *   cssGroupingRule.cssText
+ *   -> "body{margin:0;}"
+ *
+ * @param {number} index within the grouping rule's rule list of the rule to remove.
+ * @see https://www.w3.org/TR/cssom-1/#dom-cssgroupingrule-deleterule
+ */
+ CSSOM.CSSGroupingRule.prototype.deleteRule = function deleteRule(index) {
+	if (index < 0 || index >= this.cssRules.length) {
+		throw new RangeError("INDEX_SIZE_ERR");
+	}
+	this.cssRules.splice(index, 1)[0].parentRule = null;
+};
+
+//.CommonJS
+exports.CSSGroupingRule = CSSOM.CSSGroupingRule;
+///CommonJS