Centralize retained delete confirmation closing

docs/modernization/roadmap.md

@@ -506,6 +506,8 @@ App-level new-document, save, and layer-rename cancel callbacks now share the
 retained dialog close plus virtual-keyboard hide helper.
 Browse accept, resize accept/failure, and what's-new read-later/close callbacks
 now use a named retained dialog close helper instead of direct `destroy()` calls.
+Open/Browse delete-confirmation message boxes and shared destroy-on-click
+bindings now use that same retained dialog close 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,