agent: Refine toolbar spacing (#28373)

Release Notes:

- N/A

crates/agent/src/assistant_panel.rs

@@ -855,9 +855,11 @@ impl AssistantPanel {
                 if is_empty {
                     Label::new(Thread::DEFAULT_SUMMARY.clone())
                         .truncate()
+                        .ml_2()
                         .into_any_element()
                 } else if summary.is_none() {
                     Label::new(LOADING_SUMMARY_PLACEHOLDER)
+                        .ml_2()
                         .truncate()
                         .into_any_element()
                 } else {
@@ -873,7 +875,7 @@ impl AssistantPanel {
                     })
                     .unwrap_or_else(|| SharedString::from(LOADING_SUMMARY_PLACEHOLDER));
 
-                Label::new(title).truncate().into_any_element()
+                Label::new(title).ml_2().truncate().into_any_element()
             }
             ActiveView::History => Label::new("History").truncate().into_any_element(),
             ActiveView::Configuration => Label::new("Settings").truncate().into_any_element(),
@@ -910,6 +912,7 @@ impl AssistantPanel {
 
         let go_back_button = match &self.active_view {
             ActiveView::History | ActiveView::Configuration => Some(
+                div().pl_1().child(
                     IconButton::new("go-back", IconName::ArrowLeft)
                         .icon_size(IconSize::Small)
                         .on_click(cx.listener(|this, _, window, cx| {
@@ -928,6 +931,7 @@ impl AssistantPanel {
                             }
                         }),
                 ),
+            ),
             _ => None,
         };
 
@@ -944,8 +948,7 @@ impl AssistantPanel {
             .child(
                 h_flex()
                     .w_full()
-                    .pl_2()
+                    .gap_1()
-                    .gap_2()
                     .children(go_back_button)
                     .child(self.render_title_view(window, cx)),
             )