Function unit_factor_for_bias 

pub fn unit_factor_for_bias(unit: AdjustmentUnit) -> f64

The adjustment_factor a non-clicks AdjustmentUnit renders in, for rescaling a MIL-denominated zero-set bias into the active display unit (MBA-1360). Clicks never reaches this (the clicks arm below works on raw drop); the MIL fallback mirrors drop_to_adjustment’s own release-safe arm.