Add seperate scrollbar styling

crates/theme/src/theme.rs

@@ -682,6 +682,14 @@ pub struct Scrollbar {
     pub thumb: ContainerStyle,
     pub width: f32,
     pub min_height_factor: f32,
+    pub git: GitDiffColors
+}
+
+#[derive(Clone, Deserialize, Default)]
+pub struct GitDiffColors {
+    pub inserted: Color,
+    pub modified: Color,
+    pub deleted: Color
 }
 
 #[derive(Clone, Deserialize, Default)]

crates/theme/src/ui.rs

@@ -3,7 +3,7 @@ use std::borrow::Cow;
 use gpui::{
     color::Color,
     elements::{
-        ConstrainedBox, Container, ContainerStyle, Empty, Flex, KeystrokeLabel, Label, LabelStyle,
+        ConstrainedBox, Container, ContainerStyle, Empty, Flex, KeystrokeLabel, Label,
         MouseEventHandler, ParentElement, Stack, Svg,
     },
     fonts::TextStyle,