Library rows: pause the glow animation and drop SubcomposeAsyncImage #72

What

Each visible row runs an infinite Canvas glow animation and uses a subcomposed image.

Bite

Scroll cost and battery on a long list. Visible rows only, so it does not scale with library size, but it shows on a mid-range phone.

Proposed shape

• Pause the glow at zero progress or when system animations are off.
• Use AsyncImage with a placeholder instead of SubcomposeAsyncImage.

Why not in the big-library build

It is visual polish and was not a load or memory problem.

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