## Why
Automatic title generation used a provisional thread name and only applied the
generated result while its thread remained active. Switching threads could
therefore leave the originating thread without its generated name.
## What changed
- Track title-generation requests by thread so results are persisted for the
originating thread, while preserving any name set before generation finishes.
- Show a `renaming...` spinner instead of a provisional name, including across
thread switches and failure paths.
- Add `thread-name` items to the status line and terminal title, and include the
generated thread name in both default layouts.
## Testing
- Cover automatic naming, manual-name precedence, thread switching, failed
requests, deduplication, and status-surface rendering and animation.
GitOrigin-RevId: a03ae4849bedec9f62f256fadad72c1685ce46e0
Felipe Coury
a1294e57f1