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/parse5/dist/common/token.js

@@ -0,0 +1,20 @@
+export var TokenType;
+(function (TokenType) {
+    TokenType[TokenType["CHARACTER"] = 0] = "CHARACTER";
+    TokenType[TokenType["NULL_CHARACTER"] = 1] = "NULL_CHARACTER";
+    TokenType[TokenType["WHITESPACE_CHARACTER"] = 2] = "WHITESPACE_CHARACTER";
+    TokenType[TokenType["START_TAG"] = 3] = "START_TAG";
+    TokenType[TokenType["END_TAG"] = 4] = "END_TAG";
+    TokenType[TokenType["COMMENT"] = 5] = "COMMENT";
+    TokenType[TokenType["DOCTYPE"] = 6] = "DOCTYPE";
+    TokenType[TokenType["EOF"] = 7] = "EOF";
+    TokenType[TokenType["HIBERNATION"] = 8] = "HIBERNATION";
+})(TokenType || (TokenType = {}));
+export function getTokenAttr(token, attrName) {
+    for (let i = token.attrs.length - 1; i >= 0; i--) {
+        if (token.attrs[i].name === attrName) {
+            return token.attrs[i].value;
+        }
+    }
+    return null;
+}