[Feature] Ability to choose different models per chat

[minspresso]

Problem Description
Seems like the model-picking is global setting.

Proposed Solution
It would be nice if we can choose the model per chat on the left.

Additional Context
Certain prompts I want to use with OpenAI, while other chats I want to use it with Claude, for example.

[Bin-Huang]

Actually, this functionality is already available. You can select a specific model for each chat individually. Simply click on the title of the conversation, and you'll see the option to adjust the model settings for that specific chat.

[Stevoni]

I think the OP is requesting something similar to what I put together tonight:

The models are configured using the current settings page but then can be selected on a per chat basis.

I created a PR with these changes and linked to this conversation, #2007