The trailing check that marks a chosen row in a full-screen picker was
private to OptionPicker, so every consumer hand-rolled its own copy.
Calendula alone carried five, and they had drifted: the kit drew
Icons.Rounded.Check, all five app copies drew Icons.Default.Check.
Make it public with KDoc so pickers share one selection affordance
instead of re-deriving it. Rounded wins, as the kit's existing choice.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
