Fix expand sidebar scrolling

[kmcginnes]

Description

The expand sidebar scrolling is annoying to use when vertical height is limited. It was using percentage heights for sections of the UI.

Instead, I allow the full content beneath the vertex header to be scrolled. The expand button will be in the bottom corner if there is enough height to accomplish that without scrolling. If not, the user will need to scroll for the expand button.

When there are more than 5 neighbors, A "show more" button will appear. When clicked, all the neighbors will show. The user can collapse it again.

Validation

Here is a 30 second video showing off this new behavior.

CleanShot.2024-06-14.at.11.43.42.mp4

Related Issues

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0
  license.
• I have run pnpm checks to ensure code compiles and meets standards.
• I have run pnpm test to check if all tests are passing.
• I have covered new added functionality with unit tests if necessary.
• I have added an entry in the Changelog.md.

[vkagamlyk]

thanks!