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

app/gcompose/src/ViewportPane.cpp

@@ -113,6 +113,10 @@ void ViewportPane::setObject(uLib::Object* obj) {
     }
 }
 
+void ViewportPane::setContext(uLib::ObjectsContext* context) {
+    m_displayEditor->setContext(context);
+}
+
 void ViewportPane::setViewport(QWidget* viewport, const QString& title) {
     if (m_viewport) {
         delete m_viewport;