RecentDmConversationsPage [nfc]: Add TODO for muting users

Author: chrisbobbe

lib/widgets/recent_dm_conversations.dart

@@ -100,6 +100,9 @@ class RecentDmConversationsItem extends StatelessWidget {
         title = selfUser.fullName;
         avatar = AvatarImage(userId: selfUser.userId);
       case [var otherUserId]:
+        // TODO(#296) actually don't show this row if the user is muted?
+        //   (should we offer a "spam" style summary screen of recent 1:1 DM
+        //   conversations from muted users?)
         final otherUser = store.users[otherUserId];
         title = otherUser?.fullName ?? '(unknown user)';
         avatar = AvatarImage(userId: otherUserId);