git_panel: Add hover state to latest commit button (#46046)

The button for opening the latest commit view didn't have a hover state,
but now it does!

<img width="400" height="548" alt="Screenshot 2026-01-04 at 8  44@2x"
src="https://github.com/user-attachments/assets/6a58fefb-5f3f-4973-b5e8-35c400996e12"
/>

Release Notes:

- N/A

crates/git_ui/src/git_panel.rs

@@ -4367,23 +4367,24 @@ impl GitPanel {
 
         Some(
             h_flex()
-                .py_1p5()
-                .px_2()
+                .p_1p5()
                 .gap_1p5()
                 .justify_between()
                 .border_t_1()
                 .border_color(cx.theme().colors().border.opacity(0.8))
                 .child(
                     div()
+                        .id("commit-msg-hover")
+                        .px_1()
                         .cursor_pointer()
-                        .overflow_hidden()
                         .line_clamp(1)
+                        .rounded_sm()
+                        .hover(|s| s.bg(cx.theme().colors().element_hover))
                         .child(
                             Label::new(commit.subject.clone())
                                 .size(LabelSize::Small)
                                 .truncate(),
                         )
-                        .id("commit-msg-hover")
                         .on_click({
                             let commit = commit.clone();
                             let repo = active_repository.downgrade();
@@ -4415,7 +4416,7 @@ impl GitPanel {
                 )
                 .when(commit.has_parent, |this| {
                     let has_unstaged = self.has_unstaged_changes();
-                    this.child(
+                    this.pr_2().child(
                         panel_icon_button("undo", IconName::Undo)
                             .icon_size(IconSize::XSmall)
                             .icon_color(Color::Muted)