actions: Add markNarrowAsRead dialog to StarredMessagesNarrow view

Author: chungwwei

lib/widgets/actions.dart

@@ -33,7 +33,8 @@ abstract final class ZulipAction {
     final zulipLocalizations = ZulipLocalizations.of(context);
 
     if (narrow is CombinedFeedNarrow || narrow is ChannelNarrow ||
-      narrow is MentionsNarrow || narrow is KeywordSearchNarrow) {
+      narrow is MentionsNarrow || narrow is KeywordSearchNarrow ||
+      narrow is StarredMessagesNarrow) {
       final didConfirm = showSuggestedActionDialog(context: context,
         title: zulipLocalizations.markAllAsReadConfirmationDialogTitle,
         message: zulipLocalizations.markAllAsReadConfirmationDialogMessage,