Implement snapToEnd property for Fabric ScrollView

vnext/Microsoft.ReactNative/Fabric/Composition/ScrollViewComponentView.cpp

@@ -805,6 +805,15 @@ void ScrollViewComponentView::updateProps(
   if (oldViewProps.zoomScale != newViewProps.zoomScale) {
     m_scrollVisual.Scale({newViewProps.zoomScale, newViewProps.zoomScale, newViewProps.zoomScale});
   }
+
+  if (!oldProps || oldViewProps.snapToEnd != newViewProps.snapToEnd) {
+    // snapToEnd property is used with snapToOffsets to control whether
+    // the end of the scroll content should be treated as a snap point.
+    // This property is now accessible in Fabric ScrollView implementation.
+    // Note: Full snap functionality requires implementing snapToOffsets and
+    // the actual snapping behavior, which is not yet implemented in Fabric.
+    m_snapToEnd = newViewProps.snapToEnd;
+  }
 }
 
 void ScrollViewComponentView::updateState(

vnext/Microsoft.ReactNative/Fabric/Composition/ScrollViewComponentView.h

@@ -155,6 +155,7 @@ struct ScrollInteractionTrackerOwner : public winrt::implements<
   bool m_dismissKeyboardOnDrag = false;
   double m_scrollEventThrottle{0.0};
   bool m_allowNextScrollNoMatterWhat{false};
+  bool m_snapToEnd{true}; // Default to true per React Native documentation
   std::chrono::steady_clock::time_point m_lastScrollEventTime{};
   std::shared_ptr<facebook::react::ScrollViewShadowNode::ConcreteState const> m_state;
 };