fix: show bot avatar in open roles indicator (#3966)

lib/pages/chat_list/chat_list.dart

@@ -43,7 +43,6 @@ import '../../widgets/matrix.dart';
 import 'package:fluffychat/utils/tor_stub.dart'
     if (dart.library.html) 'package:tor_detector_web/tor_detector_web.dart';
 
-
 enum PopupMenuAction {
   settings,
   invite,

lib/pangea/chat_list/utils/get_chat_list_item_subtitle.dart

@@ -70,6 +70,7 @@ class ChatListItemSubtitle extends StatelessWidget {
           userIds:
               room.activityRoles?.roles.values.map((r) => r.userId).toList() ??
                   [],
+          room: room,
           space: room.courseParent,
         );
       } else if (room.activityIsFinished) {

lib/pangea/course_chats/open_roles_indicator.dart

@@ -10,12 +10,14 @@ import 'package:fluffychat/widgets/avatar.dart';
 class OpenRolesIndicator extends StatelessWidget {
   final int totalSlots;
   final List<String> userIds;
+  final Room? room;
   final Room? space;
 
   const OpenRolesIndicator({
     super.key,
     required this.totalSlots,
     required this.userIds,
+    this.room,
     this.space,
   });
 
@@ -26,19 +28,21 @@ class OpenRolesIndicator extends StatelessWidget {
       totalSlots - userIds.length,
     );
 
+    final roomParticipants = room?.getParticipants() ?? [];
     final spaceParticipants = space?.getParticipants() ?? [];
 
     return Row(
       spacing: 2.0,
       children: [
         ...userIds.map((u) {
-          final user = spaceParticipants.firstWhereOrNull(
-            (p) => p.id == u,
-          );
+          final user = roomParticipants.firstWhereOrNull((p) => p.id == u) ??
+              spaceParticipants.firstWhereOrNull((p) => p.id == u);
+
           return Avatar(
             mxContent: user?.avatarUrl,
-            userId: user?.calcDisplayname() ?? u.localpart ?? u,
+            name: user?.calcDisplayname() ?? u.localpart ?? u,
             size: 16,
+            userId: u,
           );
         }),
         ...List.generate(remainingSlots, (_) {