Show the eraser's ring the moment the eraser is out

The replay's drawing layer now follows the pointer whether or not the pen
is out, so the ring is under it before it moves. The build script's note
on Rust's floor names both architectures'.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2d203a9527Dara Adedeji committed on 10/17/2026, 7:42:42 PMparent265a87b

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