[v12] feat(ui-list): List rework

[git-nandor]

INSTUI-4876 INSTUI-4877

Summary

Migrated List and InlineList component from the old theming system.

Test plan

On the documentation page, verify that everything displays and works correctly.

Co-Authored-By: 🤖 Claude

[github-actions[bot]]

PR Preview Action v1.6.3 :---: |

:rocket: View preview at
https://instructure.design/pr-preview/pr-2308/

|

Built to branch gh-pages at 2025-12-19 10:24 UTC.
Preview will be ready when the GitHub Pages deployment is complete.

[git-nandor]

List items aren’t getting the proper tokens for some reason. The text color should be white in the dark theme, and the font family should change as well. Maybe they’re not using the inlineListItem / listItem CSS values. 

Solved. The tokens now receive the correct values.