The panel, its mask and the loader all moved to overviewOpen ||
missionControlOpen when mission control landed; the Column holding them
did not. So the second-stage pill swipe raised a panel whose entire
contents were invisible — WindowOverview instantiated, laid out, and never
shown.
Search stays overview-only: mission control takes no keyboard focus on
purpose, so a field there is one you can see and cannot use. Outside-tap
now clears both states, because with no focus grab that tap is mission
control's only way back.