- New `gt mail peek` command shows compact preview of first unread message
- Left-click on status-right (mail icon area) opens popup with mail preview
- Popup shows subject, sender, body preview (truncated to 500 chars)
- Shows count of additional unread messages if any
- Silent exit (code 1) when no unread mail
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>