Add comprehensive .gitignore

maternal-web/components/common/PerformanceMonitor.tsx

@@ -0,0 +1,20 @@
+'use client';
+
+import { useEffect } from 'react';
+import { initPerformanceMonitoring } from '@/lib/performance/monitoring';
+
+/**
+ * PerformanceMonitor Component
+ *
+ * Client-side component that initializes web vitals monitoring
+ * Should be included once in the root layout
+ */
+export const PerformanceMonitor: React.FC = () => {
+  useEffect(() => {
+    // Initialize performance monitoring on client side
+    initPerformanceMonitoring();
+  }, []);
+
+  // This component doesn't render anything
+  return null;
+};