Centralize retained floating panel closing

docs/modernization/debt.md

@@ -544,6 +544,9 @@ agent or engineer to remove them without reconstructing context from chat.
 - 2026-06-12: DEBT-0063/DEBT-0058 were narrowed again. App message-dialog
   cancel-button removal, layer-rename finish cleanup, and recording export
   progress cleanup now route retained closing through `src/legacy_ui_overlay_services.*`.
+- 2026-06-12: DEBT-0063 was narrowed again. Floating-panel close and drag-outline
+  cleanup now use the retained close helper in `src/legacy_ui_overlay_services.*`;
+  drag placeholder reparenting and dock/drop mutation remain legacy-owned.
 - 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

@@ -515,6 +515,8 @@ Cloud publish prompts, upload/download progress dialogs, and cloud browser
 download-close now use the retained overlay close helpers.
 App message-dialog cancel-button removal, layer-rename finish cleanup, and
 recording export progress cleanup also route through those helpers.
+Floating-panel close and drag-outline cleanup now use the same retained close
+helper while drag 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,