chore: Follow up fix app bar

lib/pages/chat/chat_app_bar_title.dart

@@ -44,13 +44,16 @@ class ChatAppBarTitle extends StatelessWidget {
             size: 32,
           ),
           const SizedBox(width: 12),
-          Text(
+          Expanded(
+            child: Text(
               room.getLocalizedDisplayname(MatrixLocals(L10n.of(context)!)),
               maxLines: 1,
+              overflow: TextOverflow.ellipsis,
               style: const TextStyle(
                 fontSize: 16,
               ),
             ),
+          ),
         ],
       ),
     );