The .sv$ recovery copies only need to survive a crash, so they are removed on
a clean save (Save and Save-As both delete the file's .sv$ after writing) and
on a clean exit — a new exit_app() runs cleanup_autosaves over every open tab
before quitting, and all iced::exit() paths now funnel through it. A leftover
.sv$ therefore signals an unclean shutdown, i.e. something to recover.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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