Fix sizing of event previews

lib/widgets/event_preview.dart

@@ -14,11 +14,12 @@ class EventPreview extends StatelessWidget {
     child: Padding(
       padding: EdgeInsets.symmetric(vertical: 4),
       child: Row(
+        mainAxisSize: MainAxisSize.min,
         spacing: 12,
         children: [
           if (event.content is MessageContent) MessageAvatar(event),
 
-          Expanded(
+          Flexible(
             child: Wrap(
               crossAxisAlignment: WrapCrossAlignment.center,
               spacing: 8,

lib/widgets/lazy_loading/message_displayname.dart

@@ -30,8 +30,7 @@ class MessageDisplayname extends ConsumerWidget {
                   globalPosition: details.globalPosition,
                 )
               : null,
-          child: Row(
-            mainAxisSize: MainAxisSize.min,
+          child: Wrap(
             spacing: 4,
             children: [
               Text(