In the "Auto" model selection mode, please explicitly show the model being us...

In the "Auto" model selection mode, please explicitly show the model being used for the current task in the prompt text box rather than a hidden info icon after the model response.

This is already available in VS Code and Copilot CLI, and will be helpful in the Copilot app as well.

---
| Field | Value |
| --- | --- |
| App version | 1.1.5 |
| OS | Windows 10.0.26200 |
| Theme | GitHub |
| Path | /chat |
| Tenure | Week 9 |

Start at the /chat path and inspect the current Auto-mode prompt text box and the hidden info icon shown after the model response. Compare the requested behavior with the existing model display in VS Code and Copilot CLI, then verify that the Copilot app shows the model used for the current task directly in the text box.

Scritto dal modello di indicizzazione a partire dal testo della issue.