Add col/row resize cursor styles

[smirzaei]

This PR fixes a small issue I noticed with resize cursors. The column/row resize cursors were missing and in a few places we were using ew-resize and ns-resize even though the documentation mentions col-resize and row-resize.

Finally updated the panes in the workspace to use the new column/row resize cursors.

Before:

After:

Release Notes:

• Added column/row resize cursor styles to GPUI
• Fixed the existing references that were incorrectly using ew-resize for column resize and ns-resize for row resize
• Updated panes to use column/row resize cursors instead on ew-resize and ns-resize

[mikayla-maki]

Nice catch, thank you!

[apricotbucket28]

These don't seem to be the correct cursor styles to use in those places, VSCode for reference:

[mikayla-maki]

On macOS we use the row/colum style and in cases like these, I'd err on the side of visual consistency over perfect conformance with VSCode. But if there's a good semantic argument the other way I'd hear it @apricotbucket28

[apricotbucket28]

According to https://developer.mozilla.org/en-US/docs/Web/CSS/cursor#keyword, both should be fine. I do think they look a bit weird in Zed. Maybe old? Could be personal preference.

Resizing a window:

Table in LibreOffice

Table in Google Docs

ProtonMail

[mikayla-maki]

hmmm, that's a little tricky isn't it?

I guess it seems like the linux platform convention is closer to using the other style of cursor though, judging off of the 'resize window' icon, so maybe let's fix forward and swap back to the original ew/ns-resize?

[smirzaei]

Yeah I agree. I don't see a lot of difference, most importantly I wanted the ability to use col-resize and row-resize cursors in GPUI.

Github also uses the col/row-resize cursor style.