Function WebVitals

Web Vitals measurement component

Measures and logs Core Web Vitals metrics:

• LCP (Largest Contentful Paint): Time to render largest content element
• INP (Interaction to Next Paint): Responsiveness to user interactions (replaced FID)
• CLS (Cumulative Layout Shift): Visual stability measure
• FCP (First Contentful Paint): Time to first content render
• TTFB (Time to First Byte): Server response time

In production, these metrics can be sent to analytics services for monitoring and optimization.