Make status bar an actual divider

[xyzqm]

Description

Previously, the status bar was just attached to the bottom of the editor, whereas in Xcode, it acts essentially as a thick divider. This PR aims to get the status bar to be more like Xcode's.

Relevant SO article: https://stackoverflow.com/questions/40643604/can-i-use-a-custom-view-as-a-nssplitviews-divider/40659541

Related Issues

• Fixes #1729

Checklist

• [ ] fix bug detailed in video below
• [ ] get maximization/collapse buttons to work

• [ ] I read and understood the contributing guide as well as the code of conduct
• [ ] The issues this PR addresses are related to each other
• [ ] My changes generate no new warnings
• [ ] My code builds and runs on my machine
• [ ] My changes are all related to the related issue above
• [ ] I documented my code

Screenshots

As shown in the video below, normal drags + collapsing the editor work fine, but for some reason collapsing the terminal causes really jank behavior.

https://github.com/CodeEditApp/CodeEdit/assets/65467530/2beabea9-362b-40d4-88f8-3efafbeeaaec

[austincondiff]

Does this include your work with #1701? I noticed that it was closed.

[xyzqm]

Yes, the goal is to eventually integrate the changes from #1701, but I want to iron out the status bar first.

[tom-ludwig]

@danielzsh Any updates on the status? Is this still in progress?

[xyzqm]

Haven't worked on it in a while since it was way too hard to get working :( I tried two approaches:

1. making the divider thick and drawing the status bar over it and
2. having 3 views in the split, with the middle one being the status bar But they both led to very jank results (which I can't quite recall at the moment).

[austincondiff]

I don't think this is necessary anymore with the recent changes we've made to the utility area. Thanks so much for the effort @danielzsh!