fix(tui): include surrounding context in edit approval preview

[liruifengv]

Related Issue

No linked issue — this is a focused bug fix reported during TUI usage.

Problem

When approving an Edit tool call, the summary panel shows the diff with surrounding context lines, but pressing ctrl+e to expand the preview opened a viewer that only displayed added/removed lines. The expanded view therefore contained less information than the collapsed summary.

What changed

• ApprovalPreviewViewer now renders the expanded diff with renderDiffLinesClustered (contextLines: 3, no maxLines cap) instead of renderDiffLines, so the full preview includes surrounding context.
• Added oldStart/newStart options to renderDiffLinesClustered so Edit hunks keep correct line numbers in the expanded view.
• Added tests covering both the line-number offset and the presence of context lines in the preview viewer.

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: d5bc4f4

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]

pnpm dlx https://pkg.pr.new/@moonshot-ai/kimi-code@d5bc4f4

npx https://pkg.pr.new/@moonshot-ai/kimi-code@d5bc4f4

commit: d5bc4f4