⚡ Bolt: optimize scroll-to-top listener state dispatches

[google-labs-jules]

💡 What: Optimized ScrollToTopButton scroll event listener in src/components/upArrow.tsx.

🎯 Why: During user scrolling, the scroll event fires dozens of times per second. Previously, calling setIsVisible(window.scrollY > 300) on every scroll event caused React state dispatches even when the boolean visibility state didn't change.

📊 Impact: Caching the visibility state in a local closure variable (isCurrentlyVisible) prevents redundant setState calls and React scheduler dispatches on every scroll tick, eliminating unnecessary work on the main thread during scrolling.

🔬 Measurement: Verified with unit tests (pnpm test) and type checking (pnpm exec tsc --noEmit).

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PR created automatically by Jules for task 15504515988094757589 started by @amrabed

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Project	Deployment	Actions	Updated (UTC)
amrabed-github-io	Ready	Preview	Aug 18, 2026 4:12am