fix(desmos): fix lots of unstyled text

[cootshk]

🗒 Checklist 🗒

• I have read and followed Catppuccin's userstyle contributing guidelines.

• I used AI (or AI-assistance) for this change.

🔧 What does this fix? 🔧

• Slider (Desmos: Slider Text Hard to Read #2228)

• Legacy Buttons

This spacing is an issue in vanilla desmos too.

• Built-in functions

• Saved graph folders & titles

• Example graphs
  (i forgot to take a screenshot of this one, but the titles are the same unreadable color as saved graphs)

• Line numbers (Desmos: Tab Number Hard To Read When Not Selected #2227)

• Tutorial (Desmos: Tutorial Unthemed #2234)

• (desmodder) IntelliSense

• the new graph button

• graph type filters

• Saved graph checkbox is not the accent color

🔍 Reproduction Steps 🔍

Most of these things you can find just by viewing them in Desmos. For the legacy randomization button, enable the Desmodder text mode plugin, type f()=random(), enter text mode, and finally exit text mode

Fixes

Fix	Image
Slider
Legacy Buttons
Built-in functions
Saved graph folders & titles
Example graphs
Line numbers
Tutorial
IntelliSense
New graph
graph type filters
Checkboxes	I personally don't believe the border around the checkbox is needed, but vanilla Desmos has that too so I won't remove it.

Closes #2227, closes #2228, closes #2234

[gradylink]

Lgtm