Set conversation extra data

Use ex to store custom conversation-level application data.

const previous = JSON.parse(conversation.ex || '{}');

await openimsdk.setConversation({
  conversationID,
  ex: JSON.stringify({
    ...previous,
    category: 'work',
  }),
});

ex is a complete string; the SDK does not merge JSON automatically. If several modules share it, give each one a stable namespace and preserve data owned by the other modules before writing.

After the Promise succeeds, merge the latest conversation from OnConversationChanged by conversationID. See Get the conversation list for the complete listener.