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/ts-jest/dist/legacy/compiler/compiler-utils.js

@@ -0,0 +1,32 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.SOURCE_MAPPING_PREFIX = void 0;
+exports.updateOutput = updateOutput;
+const utils_1 = require("../../utils");
+/**
+ * Rely on TypeScript compiled output generation which contains this prefix to point to sourcemap location.
+ */
+exports.SOURCE_MAPPING_PREFIX = 'sourceMappingURL=';
+/**
+ * Update the output remapping the source map.
+ */
+function updateOutput(outputText, normalizedFileName, sourceMap) {
+    if (sourceMap) {
+        const base64Map = Buffer.from(updateSourceMap(sourceMap, normalizedFileName), 'utf8').toString('base64');
+        const sourceMapContent = `data:application/json;charset=utf-8;base64,${base64Map}`;
+        // sourceMappingURL= prefix is always at the end of compiledOutput, using lastIndexOf should be the safest way to substring
+        return (outputText.slice(0, outputText.lastIndexOf(exports.SOURCE_MAPPING_PREFIX) + exports.SOURCE_MAPPING_PREFIX.length) +
+            sourceMapContent);
+    }
+    return outputText;
+}
+/**
+ * Update the source map contents for improved output.
+ */
+const updateSourceMap = (sourceMapText, normalizedFileName) => {
+    const sourceMap = JSON.parse(sourceMapText);
+    sourceMap.file = normalizedFileName;
+    sourceMap.sources = [normalizedFileName];
+    delete sourceMap.sourceRoot;
+    return (0, utils_1.stringify)(sourceMap);
+};