Centralize retained node teardown

docs/modernization/debt.md

@@ -555,6 +555,12 @@ agent or engineer to remove them without reconstructing context from chat.
   `src/legacy_ui_overlay_services.*`, and brush/grid progress or recovery
   message dialogs now use the retained dialog close helper instead of direct
   `destroy()` calls. Checked handles and scoped callback ownership remain open.
+- 2026-06-12: DEBT-0063 was narrowed again. Floating-panel placeholder detach/
+  destroy, cloud-loading alignment cleanup, brush-preset item removal, and
+  retained popup-panel parent detach now route through named retained node
+  helpers in `src/legacy_ui_overlay_services.*`. Floating-panel dock/drop
+  reparenting still uses legacy child-vector ownership until checked handles
+  land.
 - 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

@@ -521,6 +521,9 @@ helper while drag reparenting remains legacy-owned.
 Layer-row, animation-timeline, and heightmap-overlay drag release paths now use
 the same retained mouse-capture release helper, and brush/grid progress or
 recovery message dialogs now route through the retained dialog close helper.
+Floating-panel placeholder detach/destroy, cloud-loading alignment cleanup,
+brush-preset item removal, and retained popup-panel parent detach now use named
+retained node helpers; dock/drop reparenting remains legacy-owned.
 Raw popup callback captures and full close/capture ownership remain part of
 `DEBT-0063`.
 `pano_cli inspect-image` exposes PNG IHDR metadata as JSON,