Centralize layout unload destruction

docs/modernization/debt.md

@@ -588,6 +588,11 @@ agent or engineer to remove them without reconstructing context from chat.
   checkbox icon removal now route retained node destruction through
   `src/legacy_ui_overlay_services.*`. The underlying `Node` tree still exposes
   raw child pointers and public destroy state.
+- 2026-06-12: DEBT-0063 was narrowed again. Layout unload root destruction and
+  popup tick-overlay close callbacks now route retained node destruction through
+  `src/legacy_ui_overlay_services.*`. `Node::destroy()` itself remains the
+  compatibility boundary until checked tree handles replace raw parent/child
+  mutation.
 - 2026-06-05: DEBT-0011 was narrowed. The Windows app package smoke target now
   passes the configure-time CMake executable into `package-smoke.ps1`, so VS
   2026 generator validation does not depend on an older `cmake` on PATH, and

docs/modernization/roadmap.md

@@ -537,6 +537,8 @@ Legacy document-open import/discard prompts and brush-package export completion
 now route retained dialog closing through the same helper.
 Flood-fill tool teardown and checkbox icon removal now route retained node
 destruction through that helper as well.
+Layout unload root destruction and popup tick-overlay close callbacks now route
+retained node destruction through that 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,