Gracefully handle some edge cases in quick scrub

- Switch to normal overview if task fails to launch in onQuickScrubEnd()
- Stop auto-advancing if recents isn't visible
- Wait until transition to quick scrub completes before launching

Bug: 77521777
Bug: 78557737
Change-Id: I5206c0d3c52bf792f52cf3e7adcf03f8a2de18bb