Performance enhancements galore! New themining system

This is once again a huge commit, but its mostly performance
improvements along with some bug fixes and refactoring. It also includes
changes to the theming systems. I'm still not 100% happy with the
theming system, but its better than before.

Model fetching has been dramatically improved! Nearly all the important
computation and pre-processing has been moved to the server. This has
also somehow fixed the way model details are loaded, which was causing
many models to be missing their details despite models.dev having them.

The markdown renderer has once again been changed, but I'm mostly
certain that this is the last time major changes will be made to it. The
renderer is not spamming components, bloating memory usage, and its not
using a bug prone custom written chunking system.

There's also a lot more that I haven't mentioned and honestly forgot. I
need to get better commit hygiene tbh.

BUGS.md

@@ -4,10 +4,10 @@
        I'm not entire sure why, I think its a race condition, but I'm not sure.
        I _do not_ think that triplit-nuxt is the culprit, but I'm not sure.
 
-2. [X] The logic to handle hovering over the sidebar is half-baked at best. On the
+2. [x] The logic to handle hovering over the sidebar is half-baked at best. On the
        agents route, the back arrow sometimes stays full sized
 
-3. [X] If you open the theme switcher on the sidenav then close it and re-open
+3. [x] If you open the theme switcher on the sidenav then close it and re-open
        it _without_ moving your mouse off of the sidenav, the agent button/dropdown
        trigger will slowly crawl to the right (likely related to #2).
 
@@ -28,4 +28,4 @@
        If input was typed into the chat input **before hydation** the message send button
        will be on the left. **THIS WAS BECAUSE OF GRAMMARLY. I HATE YOU GRAMMARLY.**
 
-10. [ ] Multiple markdown blocks might be edited with the same content at the same time
+10. [ ] Multiple markdown blocks might be edited with the same content at the same time