Render editor fold indicators using `Disclosure`s (#13008)
This PR updates the spots where we render the fold indicators in editors
to use the `Disclosure` component instead of re-implementing similar UI.
This makes this UI more consistent across Zed.
Release Notes:
- N/A
1a40e98413Marshall Bowers committed on 6/13/2024, 8:05:47 PM· committed by GitHubparentaf8e7af