feat: implement type-safe ReferenceProperty for SmartPointer fields and add UI support for object selection via context-aware dropdowns

app/gcompose/src/PropertyWidgets.h

@@ -4,6 +4,7 @@
 #include <QWidget>
 class QPushButton;
 class QSlider;
+class QComboBox;
 #include <QLabel>
 #include <QHBoxLayout>
 #include <QVBoxLayout>
@@ -21,6 +22,8 @@ class QSlider;
 #include "Math/Dense.h"
 #include "Settings.h"
 
+namespace uLib { class ObjectsContext; }
+
 namespace uLib {
 namespace Qt {
 
@@ -211,12 +214,28 @@ private:
     QPushButton* m_Button;
 };
 
+class ReferencePropertyWidget : public PropertyWidgetBase {
+    Q_OBJECT
+public:
+    ReferencePropertyWidget(ReferencePropertyBase* prop, ::uLib::ObjectsContext* context, QWidget* parent = nullptr);
+    virtual ~ReferencePropertyWidget();
+private slots:
+    void onComboChanged(int index);
+private:
+    void refreshCombo();
+    ReferencePropertyBase* m_RefProp;
+    ::uLib::ObjectsContext* m_Context;
+    QComboBox* m_Combo;
+    Connection m_ContextConnection;
+};
+
 class PropertyEditor : public QWidget {
     Q_OBJECT
 public:
     PropertyEditor(QWidget* parent = nullptr);
     virtual ~PropertyEditor();
     void setObject(uLib::Object* obj, bool displayOnly = false);
+    void setContext(uLib::ObjectsContext* context) { m_Context = context; }
     template<typename T>
     void registerFactory(std::function<QWidget*(PropertyBase*, QWidget*)> factory) {
         m_Factories[std::type_index(typeid(T))] = factory;
@@ -228,6 +247,7 @@ signals:
 private:
     void clear();
     uLib::Object* m_Object;
+    uLib::ObjectsContext* m_Context;
     QVBoxLayout* m_MainLayout;
     QScrollArea* m_ScrollArea;
     QWidget* m_Container;