🐛 Bug: Run an accessibility audit on the site

[JoshuaKGoldberg]

Before You File a Bug Report Please Confirm You Have Done The Following...

• [X] I have pulled the latest main branch of the repository.
• [X] I have searched for related issues and found none that matched my request.
• [X] This is the appropriate issue form for the tooling issue I would like to report.

Expected

Accessibility is not a bolt-on!

Actual

I haven't done a deep audit in a few features. It's mostly accessible now (and I'm checking each PR I send), but I want to fully double-check after most polish is done.

Additional Info

Marking as blocked until the frontend is more stabilized.

[JoshuaKGoldberg]

I ran through with VoiceOver and all seems well!