Closing with a recording active called Shutdown() straight away, which disposed the frame pump and the
audio mixer underneath a running loop: ffmpeg never flushed, the file was never finalized or renamed,
and the pump was torn down mid-iteration. That is the 'app goes autistic on close' report.
MainWindow_Closing now holds the window open, runs StopBeforeShutdownAsync (the ordinary stop, bounded at
~6 s so a stuck encoder cannot make the app unclosable), then closes for real. StopStream already honours
the audio-before-video ordering, so the close path inherits it instead of inventing its own teardown.
Test: with nothing running, closing must not hold the window at all (the fast path stays fast).
Scope justification: Assets/starting-background.jpg is outside this unit — the creator's replacement art,
still awaiting their visual check.
gramps
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