Add comprehensive performance monitoring and testing infrastructure

- Implement performance dashboard with real-time metrics tracking
- Add React hooks for smart polling, debouncing, and active source lookup
- Create Jest testing framework with comprehensive test suites for components, API endpoints, and utilities
- Enhance UI components with optimized rendering and memoization
- Improve polling efficiency with visibility detection and adaptive intervals

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

jest.config.js

@@ -0,0 +1,51 @@
+const nextJest = require('next/jest');
+
+/** @type {import('jest').Config} */
+const createJestConfig = nextJest({
+  // Provide the path to your Next.js app to load next.config.js and .env files
+  dir: './',
+});
+
+// Add any custom config to be passed to Jest
+const config = {
+  coverageProvider: 'v8',
+  testEnvironment: 'jsdom',
+  
+  // Setup files to run before each test
+  setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
+  
+  // Test file patterns
+  testMatch: [
+    '**/__tests__/**/*.(ts|tsx|js)',
+    '**/*.(test|spec).(ts|tsx|js)'
+  ],
+  
+  // Module name mapping for absolute imports (correct property name)
+  moduleNameMapper: {
+    '^@/(.*)$': '<rootDir>/$1',
+  },
+  
+  // Coverage settings
+  collectCoverageFrom: [
+    'app/**/*.{ts,tsx}',
+    'components/**/*.{ts,tsx}', 
+    'lib/**/*.{ts,tsx}',
+    '!**/*.d.ts',
+    '!**/node_modules/**',
+    '!**/.next/**',
+    '!**/coverage/**',
+  ],
+  
+  // Coverage thresholds
+  coverageThreshold: {
+    global: {
+      branches: 70,
+      functions: 70,
+      lines: 70,
+      statements: 70,
+    },
+  },
+};
+
+// createJestConfig is exported this way to ensure that next/jest can load the Next.js config which is async
+module.exports = createJestConfig(config);