Screen reader fails to announce the expand/collapse state of the navigation button (#15106)

* adding UIA event handler changes for navigator

* Change files

* adding ViewComponent chnages for accessibility

* removing unnecessary change file

* Remove vnext/fmt/packages.lock.json

---------

Co-authored-by: Protik Biswas <protikbiswas100@microsoft.com>

Author: protikbiswas100

change/react-native-windows-b21e071e-d9f2-45d1-92d6-b65b6246555b.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "adding UIA event handler changes for navigator",
+  "packageName": "react-native-windows",
+  "email": "protikbiswas100@microsoft.com",
+  "dependentChangeType": "patch"
+}

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

@@ -1009,7 +1009,9 @@ HRESULT __stdcall CompositionDynamicAutomationProvider::Expand() {
 
   if (!strongView)
     return UIA_E_ELEMENTNOTAVAILABLE;
+
   DispatchAccessibilityAction(m_view, "expand");
+
   return S_OK;
 }
 
@@ -1018,7 +1020,9 @@ HRESULT __stdcall CompositionDynamicAutomationProvider::Collapse() {
 
   if (!strongView)
     return UIA_E_ELEMENTNOTAVAILABLE;
+
   DispatchAccessibilityAction(m_view, "collapse");
+
   return S_OK;
 }
 

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

@@ -835,6 +835,26 @@ void ComponentView::updateAccessibilityProps(
   winrt::Microsoft::ReactNative::implementation::UpdateUiaPropertiesForAnnotation(
       EnsureUiaProvider(), oldViewProps.accessibilityAnnotation, newViewProps.accessibilityAnnotation);
 
+  // Handle expand/collapse state changes
+  if (oldViewProps.accessibilityState.has_value() != newViewProps.accessibilityState.has_value() ||
+      (oldViewProps.accessibilityState.has_value() && newViewProps.accessibilityState.has_value() &&
+       oldViewProps.accessibilityState->expanded != newViewProps.accessibilityState->expanded)) {
+    auto oldExpanded =
+        oldViewProps.accessibilityState.has_value() && oldViewProps.accessibilityState->expanded.has_value()
+        ? oldViewProps.accessibilityState->expanded.value()
+        : false;
+    auto newExpanded =
+        newViewProps.accessibilityState.has_value() && newViewProps.accessibilityState->expanded.has_value()
+        ? newViewProps.accessibilityState->expanded.value()
+        : false;
+
+    winrt::Microsoft::ReactNative::implementation::UpdateUiaProperty(
+        EnsureUiaProvider(),
+        UIA_ExpandCollapseExpandCollapseStatePropertyId,
+        static_cast<int>(winrt::Microsoft::ReactNative::implementation::GetExpandCollapseState(oldExpanded)),
+        static_cast<int>(winrt::Microsoft::ReactNative::implementation::GetExpandCollapseState(newExpanded)));
+  }
+
   if ((oldViewProps.accessibilityState.has_value() && oldViewProps.accessibilityState->selected.has_value()) !=
       ((newViewProps.accessibilityState.has_value() && newViewProps.accessibilityState->selected.has_value()))) {
     auto compProvider =