[Bug]: Provider Switch Causes Model Mismatch and "Illegal Model Request" Error

[berry-13]

What happened?

when changing the provider while a model is generating a response, the system switches back to the old provider after completion or error, but the model doesn't update. This mismatch causes an "illegal model request" error when trying to send a new message. the expected behavior is that both the provider and the model should update consistently when a change is made, allowing users to continue sending messages with the newly selected provider and model without errors

• The bug occurs when changing the provider during an ongoing response generation
• After the response finishes or an error occurs, the UI shows the old provider (the one used for generation)
• However, the model doesn't update to match the displayed provider
• Attempting to send a new message results in an "illegal model request" error
• This creates a confusing user experience and prevents normal operation after switching providers

Steps to Reproduce

1. Start generating a response with Provider A
2. While the response is being generated, switch to Provider B
3. Wait for the response to complete or for an error to occur
4. Observe that the UI switches back to Provider A
5. Attempt to send a new message
6. Observe the "illegal model request" error

What browsers are you seeing the problem on?

Firefox, Chrome, Microsoft Edge

Relevant log output

No response

Screenshots

Code of Conduct

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