gpui_macos: Migrate `prompt_for_path` to `objc2` (#63994)
# Objective
Get rid of instances of the `block` crate, as it will not compile in a
future version of Rust.
## Solution
Migrate to the `objc2` crate family.
This gets rid of `block` inside of `platform.rs` 🎉
Release Notes:
- N/A
d3865b099etidely committed on 9/10/2026, 7:28:42 AM· committed by GitHubparent26b6a26