The whole-stack AnimatedSwitcher kept two full-screen saveLayers (each
compositing backdrop + two full-screen gradients) blending on every
focus move — with CachedNetworkImage's own fade nested inside, the
dominant GPU load while browsing. Gradients are identical between items
so they never fade now; the incoming artwork fades in via Image.opacity
over the still-opaque previous one (no placeholder flash), and only the
bounded info block keeps a real cross-fade.
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