[Feature Request] Add timeout warning and context preservation for execution_time_exceeded errors

Question

**Bug Description**
⏺ Advising using Opus 4.8
  ⎿  Advisor unavailable (execution_time_exceeded). additional time or a warning+close would be better than losing the tokens or context

**Environment Info**
- Platform: darwin
- Terminal: Apple_Terminal
- Version: 2.1.175
- Feedback ID: b5ab306d-7c06-492b-b21f-89a2a44cb39d

**Errors**
```json
[]
```