Text input loses focus after user prompt

Small UI improvement: I have to take my hands off of the keyboard to re-click the focus on the text input bar in the following scenario.

1. Focus is on the text input.
2. Enter a message that will produce a user prompt ("Ask me the next question in this list") and hit enter to send the message
3. The session retains focus on the text input so you can choose an answer to the user prompt using the keyboard and press Enter to select.
4. When the user prompt decision is made and you switch back to "normal" (the turn ends?) the focus is no longer on the keyboard

Expected:
I should be able to keep my hands on the keyboard through user prompts and other prompts. If focus was on the text input during the user prompt, it should remain on the text input without having to click back in to continue.

At 0:04, I would assume that as soon as I press enter to select option A the focus would return:

https://github.com/user-attachments/assets/8dad1754-4f2a-4d85-9bf2-9acf28cc76b6

---
| Field | Value |
| --- | --- |
| App version | 1.1.13 |
| OS | macOS 26.6.2 |
| Theme | Rainglow Lavender |
| Path | /chat |
| Tenure | Week 4 |

Reproduce the issue in the /chat path using the described user-prompt flow on macOS, starting from the text input and prompt-selection interaction. Done means focus remains on the text input after selecting an option and returning to normal conversation, without requiring a mouse click.

索引モデルが issue の本文から書いたものです。