[Recorder] Add backstops for if cursor departs button #3077
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Mostly fixes #3073
Pro: If the record button is clicked/pressed while a previous recording is still active, that previous recording is finished before a new one is started.
Con: If the record button is clicked/tapped just to end a recording that is still going, a second recording blip will also be created (but at least that is easily deleted).
Pro: If focus shifts away from the button, that will also activate the end of the recording. This works if a user clicks elsewhere.
Con: This doesn't always work if the user taps/presses elsewhere, because the initial recording touch doesn't consistently shift focus to the button in the first place.
This change is