feat: use the stripped body for notifications and room previews

lib/utils/background_push.dart

@@ -595,12 +595,7 @@ class BackgroundPush {
     final title = l10n.unreadMessages(room.notificationCount);
 
     // Calculate the body
-    final body = event?.getLocalizedBody(
-          MatrixLocals(l10n),
-          withSenderNamePrefix: true,
-          hideReply: true,
-        ) ??
-        l10n.openAppToReadMessages;
+    final body = event?.plaintextBody ?? l10n.openAppToReadMessages;
 
     // The person object for the android message style notification
     final avatar = room.avatar == null

lib/widgets/list_items/chat_list_item.dart

@@ -268,11 +268,7 @@ class ChatListItem extends StatelessWidget {
                 : Text(
                     room.membership == Membership.invite
                         ? L10n.of(context).youAreInvitedToThisChat
-                        : room.lastEvent?.getLocalizedBody(
-                              MatrixLocals(L10n.of(context)),
-                              hideReply: true,
-                            ) ??
-                            '',
+                        : room.lastEvent?.plaintextBody,
                     softWrap: false,
                     maxLines: 1,
                     overflow: TextOverflow.ellipsis,