feature/Add support for multiple responses from AI assistant

[eeren3411]

Caution!

Description

In my local custom AI assistant, my assistant can send me multiple responses as different roles.

When assistant requires extra information from system, assistant runs a custom command. Which then system responds with result. Then assistant completes its response using that result. Thus, giving my assistant the ability to perform multiple step operations. So I tweaked things a bit, now chatbox supports it.

Additional Notes

It's a bit of a big PR, so it may break something. I'm especially not sure about models other than deepseek.

Screenshots

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