Implement writingDirection property for Text in Fabric by adding SetReadingDirection support

Co-authored-by: anupriya13 <54227869+anupriya13@users.noreply.github.com>

Author: Copilot

vnext/Microsoft.ReactNative/Fabric/platform/react/renderer/textlayoutmanager/WindowsTextLayoutManager.cpp

@@ -158,6 +158,28 @@ void WindowsTextLayoutManager::GetTextLayout(
   }
   winrt::check_hresult(spTextFormat->SetTextAlignment(alignment));
 
+  // Set reading direction based on baseWritingDirection
+  if (outerFragment.textAttributes.baseWritingDirection) {
+    DWRITE_READING_DIRECTION readingDirection = DWRITE_READING_DIRECTION_LEFT_TO_RIGHT;
+    switch (*outerFragment.textAttributes.baseWritingDirection) {
+      case facebook::react::WritingDirection::LeftToRight:
+        readingDirection = DWRITE_READING_DIRECTION_LEFT_TO_RIGHT;
+        break;
+      case facebook::react::WritingDirection::RightToLeft:
+        readingDirection = DWRITE_READING_DIRECTION_RIGHT_TO_LEFT;
+        break;
+      case facebook::react::WritingDirection::Natural:
+        // For Natural, default to left-to-right. In a more complete implementation,
+        // this could be determined based on the script/locale context.
+        readingDirection = DWRITE_READING_DIRECTION_LEFT_TO_RIGHT;
+        break;
+      default:
+        readingDirection = DWRITE_READING_DIRECTION_LEFT_TO_RIGHT;
+        break;
+    }
+    winrt::check_hresult(spTextFormat->SetReadingDirection(readingDirection));
+  }
+
   // Get text with Object Replacement Characters for attachments
   auto str = GetTransformedText(attributedStringBox);
   winrt::check_hresult(Microsoft::ReactNative::DWriteFactory()->CreateTextLayout(