Centralize legacy document layer bridge

src/legacy_document_layer_services.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include "app_core/document_layer.h"
+#include "foundation/result.h"
+
+#include <memory>
+
+class App;
+class Layer;
+class NodeDialogLayerRename;
+
+namespace pp::panopainter {
+
+[[nodiscard]] pp::foundation::Status execute_legacy_document_layer_rename_plan(
+    App& app,
+    const pp::app::DocumentLayerRenamePlan& plan,
+    const std::shared_ptr<NodeDialogLayerRename>& dialog);
+[[nodiscard]] pp::foundation::Status execute_legacy_document_layer_menu_plan(
+    App& app,
+    const pp::app::DocumentLayerMenuPlan& plan);
+[[nodiscard]] pp::foundation::Status execute_legacy_document_layer_merge_plan(
+    App& app,
+    const pp::app::DocumentLayerMergePlan& plan);
+[[nodiscard]] pp::foundation::Status execute_legacy_document_layer_operation_plan(
+    App& app,
+    const pp::app::DocumentLayerOperationPlan& plan,
+    const std::shared_ptr<Layer>& pending_layer = nullptr);
+
+} // namespace pp::panopainter