[BUG] Invalid input type when invoking reasoning for Mistral's reasoning models

[Gemei]

Bug Description
Chatbox is sending incorrect input type [array] when invoking reasoning ability in Mistral's Magistral models. Expected input type is [string]

Steps to Reproduce
Please provide the steps to reproduce the bug:

1. Go to Settings and enter your Mistral API Key.
2. Click Fetch to get the latest models.
3. Enable reasoning and vision for Magistral medium and small models
4. Go to chat window and select Magistral small or medium.
5. Enter this prompt (or any prompt that requires reasoning)

use your reasoning ability to answer this question
"Some Question"

Expected Results
Chatbox sends a string input to Magistral models.

Actual Results
Chatbox sends an array input to Magistral models.

Screenshots

Desktop:

• Operating System: Windows 11
• Application Version: 1.17.1