⚡ Bolt: [performance improvement] Optimize Navbar scroll event listener

[Animesh-jsx]

💡 What

Optimized the scroll event listener in the Navbar component by wrapping state updates in requestAnimationFrame with a ticking flag, adding the { passive: true } option, and ensuring proper cleanup via cancelAnimationFrame.

🎯 Why

The original implementation triggered a React state update on every single scroll event, which fires synchronously and frequently, potentially blocking the main thread and causing janky scrolling on lower-end devices.

📊 Impact

Reduces unnecessary re-renders and main thread blocking during scrolling by throttling the state updates to the browser's refresh rate (typically 60fps), and allows the browser to perform smooth scrolling without waiting for the JavaScript event handler to finish (passive: true).

🔬 Measurement

Run npm run build to verify the application builds successfully without errors. Load the application, scroll the page, and observe smoother scrolling behavior and reduced CPU usage in browser performance profiling tools.

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PR created automatically by Jules for task 13776450476194897808 started by @Animesh-jsx

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