server : Improve code snippets direction between RTL text

[ebraminio]

This turns

to this

The prompt is: سلام آیا می‌توانی کدی به زبان سی بنویسی که دو عدد را به صورت گرفته و جمع کرده و در خروجی چاپ کند؟ ممنونم (basically asks to write a C code to take two numbers and print the sum) and the model is 'phi-4-q4.gguf' of https://huggingface.co/microsoft/phi-4-gguf

If you want the picture however, it's better to not apply dir="auto" to the whole message but to apply it to every individual paragraphs, like what is suggested on markdown-it/markdown-it#635 (comment) which refers to what I implemented in gitlab years ago https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/6296 and the solution for markdown-it is to add a plugin https://github.com/dobidi/markdown-it-bidi but I wasn't sure if adding a new dependency just for this sake is acceptable and this will cover the most cases which is intended for llama-server but surely can be considered for later.