Centralize retained control capture release

docs/modernization/roadmap.md

@@ -531,6 +531,8 @@ restored floating color-panel title cleanup now use the retained detach/close/
 destroy helpers.
 Canvas mode mouse-capture release for camera, paint, line, grid, mask, and fill
 interactions now routes through the retained capture-release helper.
+Button, slider, scroll, color-wheel, color-quad, and canvas gesture-end capture
+release now route through that same helper.
 Raw popup callback captures and full close/capture ownership remain part of
 `DEBT-0063`.
 `pano_cli inspect-image` exposes PNG IHDR metadata as JSON,