Show "unplayed" dot on incoming audio messages

ts/messages/migrateLegacyReadStatus.ts

@@ -0,0 +1,17 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { MessageAttributesType } from '../model-types.d';
+import { ReadStatus } from './MessageReadStatus';
+
+export function migrateLegacyReadStatus(
+  message: Readonly<Pick<MessageAttributesType, 'readStatus'>>
+): undefined | ReadStatus {
+  const shouldMigrate = message.readStatus == null;
+  if (!shouldMigrate) {
+    return;
+  }
+
+  const legacyUnread = (message as Record<string, unknown>).unread;
+  return legacyUnread ? ReadStatus.Unread : ReadStatus.Read;
+}