A "✕" button sits left of the sync progress group and expands to
"cancel transfer" on hover; clicking asks Cancel Transfer / Keep
Copying (the copy keeps running under the dialog). Cancel stops the
worker at the next chunk boundary, removes the in-flight partial file,
and rewrites the m3u to list only tracks actually on the device — so a
cancelled sync always leaves a coherent partial playlist. That last bit
also closes a pre-existing gap: stale files are deleted before copying,
so an interruption could previously leave the old m3u pointing at
deleted files.
Recoverability proven both ways: a test asserts cancel-then-resync ends
byte-identical to an uninterrupted sync, and a live run against the
real Rabbit (cancel mid-file-2 of 3) recovered with kept=1/copies=2.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
