New setting to allow customize the cursor style when the window is unfocused

[escalonc]

What do you want to change?

I would like to add a new setting to further customize the cursor style behaviour. Currently, when the terminal window is unfocused it only shows a hollow block cursor, with no setting to customize the style. I would leave the hollow cursor as the default.

There have been some PRs about this feature, but they haven't been completed yet (#12198, #9630, #2818).

AI usage: I have used claude code to navigate and find files through the project, because I haven't worked with this project before, but I have done the changes by my myself.

Why do you want to make this change?

I've been really enjoying Ghostty so far, and I want to give something back, plus learning more about open source and zig at the same time.

I acknowledge that:

• I have read the Contributing Guide and understand the contribution process.
• I have read and agree to follow the AI Usage Policy.
• I wrote this vouch request myself, in my own voice, without AI generating it.

[escalonc]

Also I forgot to add a preview of the change that I have been working on, just to illustrate better the change.

https://github.com/ghostty-org/ghostty/compare/main...escalonc:ghostty:cursor-style-unfocused-setting?expand=1

[tristan957]

!vouch