"Pending message" doesn't clear on correct timming

Describe the bug

Found an issue where my Pending message is already consumed and the agent is thinking on it (I can read the thinking) but the message still has "(pending)" appended to it, thus misleading me.

Affected version

GitHub Copilot CLI 1.0.75.

Steps to reproduce the behavior

1. Ask tasks that need thinking while on medium or high thinking
2. Add additional prompts while it is still processing (you message is now pending)
3. Check the "Pending message" is appended
4. when the agent start thinking about your message, check the "Pending message" text is still present, although the message has already been delivered.

Expected behavior

The "pending message" should clear before the agent starts thinking about the message, becaue by now it no longer is pending but was already delivered.

Additional context

No response

GitHub Copilot CLI 1.0.75 で、中程度または高度な思考中にキューに入れられたプロンプトを送信してこれを再現し、エージェントがそのプロンプトの処理を開始したときに観察します。queued から delivered への遷移を通じて保留中メッセージの表示を追跡し、エージェントがそのメッセージについて考え始める前に「(pending)」というテキストが消えたら Issue 完了とします。