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/yargs-parser/build/lib/tokenize-arg-string.js

@@ -0,0 +1,40 @@
+/**
+ * @license
+ * Copyright (c) 2016, Contributors
+ * SPDX-License-Identifier: ISC
+ */
+// take an un-split argv string and tokenize it.
+export function tokenizeArgString(argString) {
+    if (Array.isArray(argString)) {
+        return argString.map(e => typeof e !== 'string' ? e + '' : e);
+    }
+    argString = argString.trim();
+    let i = 0;
+    let prevC = null;
+    let c = null;
+    let opening = null;
+    const args = [];
+    for (let ii = 0; ii < argString.length; ii++) {
+        prevC = c;
+        c = argString.charAt(ii);
+        // split on spaces unless we're in quotes.
+        if (c === ' ' && !opening) {
+            if (!(prevC === ' ')) {
+                i++;
+            }
+            continue;
+        }
+        // don't split the string if we're in matching
+        // opening or closing single and double quotes.
+        if (c === opening) {
+            opening = null;
+        }
+        else if ((c === "'" || c === '"') && !opening) {
+            opening = c;
+        }
+        if (!args[i])
+            args[i] = '';
+        args[i] += c;
+    }
+    return args;
+}