Moving the pointer from a row onto the button floating over it left the row
hovered: the document under a floating overlay was not walked at all while
the pointer was inside it, so every click catcher it had kept whatever state
it was last told.

Walk it with no pointer instead. Everything under the floating child learns
the pointer has gone, nothing arms, and the floating child still gets the
press.

The overlay node no longer hands its content to the interaction walk that
reaches it through the tree, only to the pass that walks floating overlays,
so its content is visited once rather than twice - the second visit was
disarming the button the first had armed. Its focusables were being
collected twice for the same reason.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MBQJGiJxUECw86CYG9JZNk