Remove deprecated std::usize import from uniform_list.rs (#62841)

<img width="993" height="370" alt="image"
src="https://github.com/user-attachments/assets/15e3a185-3328-4069-ad86-21d29f647f83"
/>

# Objective

- using `std::usize` currently is a warning, but it's a hard fairule in
rust nightly
- gpui-web requires rust nightly
- https://doc.rust-lang.org/std/usize/index.html
 
## Solution

- remove std::usize import, it would be used a primitive type

## Testing

-
https://github.com/iamnbutler/gpui-unofficial/actions/runs/32189970651/job/95882109895#step:8:753

## Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content adheres to Zed's UI standards
([UX/UI](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
and
[icon](https://github.com/zed-industries/zed/blob/main/crates/icons/README.md)
guidelines)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

---

Release Notes:

- N/A

---------

Co-authored-by: Kirill Bulatov <kirill@zed.dev>

crates/debugger_ui/src/session/running/console.rs

@@ -23,7 +23,7 @@ use project::{
     search_history::{SearchHistory, SearchHistoryCursor},
 };
 use settings::Settings;
-use std::{ops::Range, rc::Rc, usize};
+use std::{ops::Range, rc::Rc};
 use theme::Theme;
 use theme_settings::ThemeSettings;
 use ui::{ContextMenu, Divider, PopoverMenu, SplitButton, Tooltip, prelude::*};

crates/git_ui/src/git_panel.rs

@@ -84,7 +84,7 @@ use std::future::Future;
 use std::ops::Range;
 use std::path::Path;
 use std::rc::Rc;
-use std::{sync::Arc, time::Duration, usize};
+use std::{sync::Arc, time::Duration};
 use strum::{IntoEnumIterator, VariantNames};
 use theme_settings::ThemeSettings;
 use time::OffsetDateTime;

crates/gpui/src/elements/uniform_list.rs

@@ -11,7 +11,7 @@ use crate::{
     StyleRefinement, Styled, Window, point, px, size,
 };
 use smallvec::SmallVec;
-use std::{cell::RefCell, cmp, ops::Range, rc::Rc, usize};
+use std::{cell::RefCell, cmp, ops::Range, rc::Rc};
 
 use super::ListHorizontalSizingBehavior;
 

crates/project/src/debugger/breakpoint_store.rs

@@ -15,7 +15,7 @@ use rpc::{
     AnyProtoClient, TypedEnvelope,
     proto::{self},
 };
-use std::{hash::Hash, ops::Range, path::Path, sync::Arc, u32};
+use std::{hash::Hash, ops::Range, path::Path, sync::Arc};
 use text::{Bias, Point, PointUtf16, Unclipped};
 use util::maybe;
 

crates/project/src/debugger/session.rs

@@ -52,7 +52,6 @@ use std::net::{IpAddr, Ipv4Addr};
 use std::ops::RangeInclusive;
 use std::path::PathBuf;
 use std::time::Duration;
-use std::u64;
 use std::{
     any::Any,
     collections::hash_map::Entry,