lookupProgress Property
abstract val lookupProgress: Flow<Int>
How far recognition has got: -1 while the image is being analysed, then 0 to 100 as words are recognised.
The engine reports its first pass on a 0 to 70 scale and the values are stretched to fill 0 to 100, so progress can appear to slow when a second pass takes over near the end. Treat it as an indicator, not a timer.