Fix bug causing code blocks to be rendered inconsistently

[mags0ft]

Hello (a third time today!)

I've implemented a patch for the glitchy rendering of some code blocks and the broken table rendering. It seems to be working better now.

Code block rendering

BEFORE:

AFTER:

Table rendering

BEFORE:

AFTER:

I URGENTLY ADVISE YOU TO TEST THIS! I'm not quite sure I got everything right, and it'd be a pity if I break something. I did not come across any regressions myself, though (4 test cases checked).

This commit should fix issue #526.
This commit does ALSO fixes the table rendering issue #523.

Best wishes!

[mags0ft]

Important note: Apparently, this fixes both tables and code blocks, however LaTeX rendering is still buggy. From my current observations, applying these fixes might cause regressions in LaTeX display when used in combination with a reasoning model. I will look into this.

[Jeffser]

Don't worry about it, I intend on rewriting all of the message generation code, still, thanks for all the help today, I will merge this!

[mags0ft]

Okay, but please be aware that, as mentioned, this might be a regression in LaTeX rendering then!

A patch may be needed before the entire rewrite of the code is done because this makes the LaTeX rendering feature borderline insufferable - although I don't quite know how many of these bugs come from this patch and how many existed before. Some seem to have been there in the original version.

What I want to say is, I don't know if the code in this state is release-ready yet. But as you said, I'll try not to worry about it, haha.