Avatar decorations are animated APNGs and were the only motion feature not
gated on prefers-reduced-motion (chat backgrounds / seasonal overlays all
suppress motion under it). Since there's no static-frame asset to freeze to,
render just the avatar (no decoration overlay) when the user prefers reduced
motion — the only motion-respecting option. Users without the preference are
unaffected; live OS-toggle is reactive via useReducedMotion. Also relieves the
mobile perf drain of dozens of live APNGs in scrolling lists.
Reviewed: correct a11y behavior, hooks-safe, no layout dependency on the overlay.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
jaredandClaude Opus 4.8
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