wrappingLabel's alignment must reach the cell — setAlignment on the
field alone left the title and stage line left-aligned inside
full-width frames ('Updating Hermes' starting at center-looking-box
left edge). Labels now get full-width frames and cell-level centering.
linger() also switched from a runloop pump to a blocking
NSThread.sleepForTimeInterval: with the animation stopped there are no
timer sources to service, so the pump returned immediately (terminal
states lived <1s instead of the designed 1.5s/15s).
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