The profile went in with a known remainder: a brief purple frame during the
day/night transition, tracked upstream in OpenIPC/majestic#325 and deliberately
left without a board-specific workaround. That issue has since been fixed -- into
night the picture goes grey before the filter moves, coming back out it returns to
colour after the filter has shut, and the switch now reaches the stream on the next
frame instead of waiting out the current GOP. With that, dusk is clean on this
camera at the default `transitionDelayMs: 0`.
What is left is the dawn side, and it is mechanical: the bistable IR-cut filter is
still physically swinging shut while the picture is already back in colour, which
is worth about two frames of cast. `nightMode.transitionDelayMs` is the documented
pause between the picture changing and the filter moving (0-2000 ms, default 0),
and how fast a filter swings is a property of the board -- so this belongs in the
device profile rather than in any shared default. 150 ms clears it here.
Tested on the physical SVI-252B K202 by the author, repeated transitions in both
directions, both now clean.
