## Issue
- First batch of @iansltx 's work of cleaning up lint warnings #43387
## Description
- Quick PR review and grabbed as many confirmed low-risk quick wins as I
could `git checkout lint-cleanup <file/path/1> <file/path/2>`
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
## Release Notes
This release contains internal code improvements with one minor UI
tweak:
* **Style**
* Dropdown menu background color adjusted for clearer contrast in action
lists
* **Refactor**
* Improved type safety across the codebase with stricter TypeScript
annotations
* Removed unused imports and constants to reduce code clutter
* Enhanced React hook dependency arrays for more consistent component
behavior
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: Rachel Perkins <rachel@Rachels-MacBook-Pro.local>
Co-authored-by: Ian Littman <iansltx@gmail.com>
* add prettier and have it format all js code except website:
:
* trying running prettier check in CI
* fix runs on in CI
* change CI job name
* fix prettier erros and fix CI
- Move from Mocha to Jest for JS testing (Jest seems to have better support for
'watching' tests and a more active community these days).
- Codemod existing tests to Jest syntax (using https://github.com/skovhus/jest-codemods)
- Fix some errors in tests that were previously hidden.
- Update Babel.
