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change `.scroll-progress` to animate via `transform: scaleX()` rather than `width`. this prevents layout thrashing on high-frequency scroll events by offloading the animation to the gpu.
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💡 what: updated the scroll progress bar to use
transform: scaleX()instead ofwidthfor its progress animation.🎯 why: animating
widthinside a high-frequency scroll loop causes expensive layout recalculations (layout thrashing) on the main thread.📊 impact: shifts the work to the gpu, ensuring a measurably smoother scrolling experience and saving cpu cycles.
🔬 measurement: checked via playwright script running over index.html and logging dom style transforms; no failed unit tests (0 failures).
PR created automatically by Jules for task 8608022576086310144 started by @dttdrv