Add brush preset list executor bridge

src/node_panel_brush.h

@@ -15,6 +15,7 @@ struct BrushPresetListPlan;
 }
 namespace pp::panopainter {
 class LegacyBrushTextureListServices;
+class LegacyBrushPresetListServices;
 }
 
 class NodeButtonBrush : public NodeButtonCustom, public Serializer::Type
@@ -88,6 +89,8 @@ public:
 
 class NodePanelBrushPreset : public Node
 {
+    friend class pp::panopainter::LegacyBrushPresetListServices;
+
     static std::vector<NodePanelBrushPreset*> s_panels;
     bool m_interacted = false;
     NodeBrushPresetItem* m_current = nullptr;