⚡ bolt: optimize photocarousel visibility tracking#25
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- implemented `intersectionobserver` in `photocarousel.init()` to cache visibility state - replaced synchronous `getboundingclientrect()` in keydown event listener with cached state - removed unused `isinview()` method - prevents layout thrashing during keyboard navigation
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💡 what: replaced synchronous
getboundingclientrect()checks with anintersectionobserverto track thephotocarouselvisibility state.🎯 why: calling
getboundingclientrect()during frequent events likekeydowncan force the browser to synchronously recalculate layout (layout thrashing), causing jank and degrading performance. caching the visibility state with anintersectionobservercompletely eliminates this overhead.📊 impact: removes 100% of synchronous layout forced reflows during keyboard navigation of the carousel, making interaction measurably smoother.
🔬 measurement: run a performance profile in devtools while pressing arrow keys; observe the elimination of "recalculate style" and "layout" events triggered by the keydown listener.
PR created automatically by Jules for task 13215783681409584581 started by @dttdrv