⚡ Bolt: Optimize Navbar scroll listener

[Animesh-jsx]

💡 What: Wrapped the handleScroll state update in requestAnimationFrame and added { passive: true } to the window.addEventListener. Also added proper cleanup to cancel pending animation frames on unmount.

🎯 Why: The scroll event in src/components/layout/Navbar.tsx was firing synchronously on the main thread, potentially causing layout thrashing and scroll jank, especially on mobile devices or lower-end hardware. State updates were happening faster than the browser could paint.

📊 Impact: Reduces React state re-evaluations to exactly match the display refresh rate (e.g., 60fps), eliminating wasted computations. Unblocks the browser's compositor thread, ensuring smooth scrolling performance regardless of main thread activity.

🔬 Measurement: Profile the application in Chrome DevTools under the "Performance" tab. Observe the frequency of "Event: scroll" handlers and subsequent React "Commit" phases before and after the change; the handler execution time and main-thread blocking time should be visibly reduced.

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PR created automatically by Jules for task 2296999881664803778 started by @Animesh-jsx

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