Centralize retained dialog close bindings

docs/modernization/debt.md

@@ -513,6 +513,10 @@ agent or engineer to remove them without reconstructing context from chat.
   routes through `src/legacy_ui_overlay_services.*` for release, root removal,
   and callback dispatch instead of repeating that sequence in each panel class.
   Broader checked-handle and scoped-callback adoption remains open.
+- 2026-06-12: DEBT-0063/DEBT-0058 were narrowed again. About, changelog,
+  settings, and user-manual close buttons now bind retained destroy-on-click
+  behavior through `src/legacy_ui_overlay_services.*` instead of per-dialog
+  lambdas. Broader checked-handle and scoped-callback adoption remains open.
 - 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

@@ -496,6 +496,8 @@ callbacks are bound through the overlay service instead of per-panel lambdas.
 Brush, brush-preset, color, layer, grid, stroke, and color-picker popup-panel
 outside-click close handling now shares the same retained release/remove/
 callback helper.
+About, changelog, settings, and user-manual close buttons now share retained
+destroy-on-click binding through the same overlay service.
 Raw popup callback captures and full close/capture ownership remain part of
 `DEBT-0063`.
 `pano_cli inspect-image` exposes PNG IHDR metadata as JSON,