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/sprintf-js/gruntfile.js

@@ -0,0 +1,36 @@
+module.exports = function(grunt) {
+    grunt.initConfig({
+        pkg: grunt.file.readJSON("package.json"),
+
+        uglify: {
+            options: {
+                banner: "/*! <%= pkg.name %> | <%= pkg.author %> | <%= pkg.license %> */\n",
+                sourceMap: true
+            },
+            build: {
+                files: [
+                    {
+                        src: "src/sprintf.js",
+                        dest: "dist/sprintf.min.js"
+                    },
+                    {
+                        src: "src/angular-sprintf.js",
+                        dest: "dist/angular-sprintf.min.js"
+                    }
+                ]
+            }
+        },
+
+        watch: {
+            js: {
+                files: "src/*.js",
+                tasks: ["uglify"]
+            }
+        }
+    })
+
+    grunt.loadNpmTasks("grunt-contrib-uglify")
+    grunt.loadNpmTasks("grunt-contrib-watch")
+
+    grunt.registerTask("default", ["uglify", "watch"])
+}