Delete unused imports

crates/ai/src/diff.rs

@@ -1,11 +1,8 @@
 use std::{
-    cmp,
     fmt::{self, Debug},
     ops::Range,
 };
 
-use collections::BinaryHeap;
-
 struct Matrix {
     cells: Vec<isize>,
     rows: usize,

crates/ai/src/refactor.rs

@@ -7,8 +7,7 @@ use gpui::{
     WeakViewHandle,
 };
 use menu::Confirm;
-use similar::{Change, ChangeTag, TextDiff};
-use std::{env, iter, ops::Range, sync::Arc};
+use std::{env, sync::Arc};
 use util::TryFutureExt;
 use workspace::{Modal, Workspace};