Centralize retained message dialog close callbacks

docs/modernization/debt.md

@@ -517,6 +517,10 @@ agent or engineer to remove them without reconstructing context from chat.
   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.
+- 2026-06-12: DEBT-0063/DEBT-0058 were narrowed again. Message-box
+  submit/cancel and input-box cancel destroy callbacks now use retained close
+  helpers from `src/legacy_ui_overlay_services.*`. Dialog lifetime still uses
+  raw `Node` callbacks until checked handles and scoped connections 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

@@ -498,6 +498,8 @@ 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.
+Message-box submit/cancel and input-box cancel destroy callbacks now use the
+same retained close binding 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,

src/legacy_ui_overlay_services.h

@@ -82,4 +82,11 @@ void bind_legacy_click_destroys_node(ButtonT& button, Node& target) noexcept
     };
 }
 
+inline std::function<void(Node*)> legacy_destroy_node_callback(Node& target)
+{
+    return [&target](Node*) {
+        target.destroy();
+    };
+}
+
 } // namespace pp::panopainter

src/node_input_box.cpp

@@ -1,5 +1,6 @@
 #include "pch.h"
 #include "log.h"
+#include "legacy_ui_overlay_services.h"
 #include "node_input_box.h"
 #include "layout.h"
 
@@ -24,7 +25,7 @@ void NodeInputBox::init()
             on_submit(this, m_field_text->m_text);
     };
     btn_cancel = find<NodeButton>("btn-cancel");
-    btn_cancel->on_click = [&](Node*) { destroy(); };
+    pp::panopainter::bind_legacy_click_destroys_node(*btn_cancel, *this);
     m_capture_children = false; // don't capture children events on mouse_capture
 }
 

src/node_message_box.cpp

@@ -1,5 +1,6 @@
 #include "pch.h"
 #include "log.h"
+#include "legacy_ui_overlay_services.h"
 #include "node_message_box.h"
 #include "layout.h"
 
@@ -23,7 +24,7 @@ void NodeMessageBox::init()
             on_submit(this);
     };
     btn_cancel = find<NodeButton>("btn-cancel");
-    on_submit = btn_cancel->on_click = [&](Node*) { destroy(); };
+    on_submit = btn_cancel->on_click = pp::panopainter::legacy_destroy_node_callback(*this);
     m_capture_children = false; // don't capture children events on mouse_capture
 }