Fix importmap

Fixed chat parsing issue when using Mistral template with system message

Refactoring to reduce code duplication

Fix text decoding in OpenAI non-streaming responses

Add support for non-standard OpenAI responses sent by llama.cpp

Fix for new llama.cpp API response body

Fix potential race condition when saving sessions

Don't try saving inactive sessions

Fixes to prediction preview

Disable prediction preview for AI Horde backend