fix(tui): clear debug timing status on undo

[liruifengv]

Related Issue

No related issue.

Problem

With KIMI_CODE_DEBUG=1, each completed step prints a [Debug] timing line to the transcript. That line was added directly as a bare status component, so it was never tracked as part of a turn. After /undo, the user and assistant messages were removed, but the debug timing lines stayed behind.

What changed

Append the debug timing line as a turn-scoped transcript status entry (carrying the current turnId) instead of a bare status component. This places it in the same undo context as other per-turn status output (background tasks, approval notices), so /undo now removes it together with the rest of the turn. The rendered output is unchanged.

Added a message-flow test that verifies the debug timing line is removed on undo.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

🦋 Changeset detected

Latest commit: 66bcedc

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@moonshot-ai/kimi-code	Patch

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[pkg-pr-new]

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commit: 66bcedc