## What changed
Add a selectable `daybreak` item to the status line and terminal title, including setup previews and terminal-title validation. Display `Daybreak on` when enabled for the thread and `Daybreak off` otherwise, including during side conversations.
## Testing
Add coverage for on/off rendering and side conversations, update setup preview snapshots, and verify that terminal-title diagnostics accept `daybreak`.
GitOrigin-RevId: b0b7a6f0ee0a107ba4ee2d56113a5b9b6ebd1d41