The bottom bar, the Info panel and the filter bar each drew their own
row of stars, and the grid badge, filmstrip badges and compare caption
had private painter loops. They now share rating::Rating (a clickable
row: hover previews, clicking the current rating clears it, read-only
and disabled states, left/right arrows on a focused star) and
rating::paint_rating / paint_star for painter-only contexts.
Existing automation ids (star:bottom:n, star:info:n, filter:starN) are
unchanged. The preset, profile and theme favourite stars use
paint_star too, so Icon::Star lives only in rating.rs.
Co-Authored-By: Claude <noreply@anthropic.com>
