IntervalTransition
type IntervalTransition = "transform" | "fade";
Source: types/src/index.ts:207
How a same-asset interval switch animates. 'transform' (default) lerps
each visible column into its counterpart. 'fade' fades the old scene out
then the new one in — use when the two windows don’t share a 1:1 pairing
(e.g. a fixed lookback).