Centralize retained document session dialog closing

docs/modernization/roadmap.md

@@ -508,6 +508,9 @@ 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.
+Document-session overwrite, unsaved-close, save-before-workflow, and accepted
+new/save document cleanup now route retained dialog closing through the same
+helpers.
 Raw popup callback captures and full close/capture ownership remain part of
 `DEBT-0063`.
 `pano_cli inspect-image` exposes PNG IHDR metadata as JSON,