Add own prompt message box

[onexbash]

Check for existing issues

• [X] Completed

Describe the feature

I would love an own message box for prompts, alerts, etc. The default one from apple that is currently used, looks very off in the zed layout.

If applicable, add mockups / screenshots to help present your vision of the feature

[SomeoneToIgnore]

Would something like https://github.com/zed-industries/zed/pull/8312 help? There's a whole family of those for different cases in Zed currently, but all of them share similar ideas: some rectangle appearing on the bottom right with the possibility to close and, sometimes, click to toggle more actions.

[jansol]

I think #8980 is closer to what was being asked here?