agent_ui: Show title edit for terminals in agent panel (#57005)

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 is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

Release Notes:

- N/A

crates/agent_ui/src/agent_panel.rs

@@ -3953,6 +3953,14 @@ impl AgentPanel {
         }
     }
 
+    fn should_show_title_edit(&self, window: &Window, cx: &Context<Self>) -> bool {
+        matches!(
+            self.visible_surface(),
+            VisibleSurface::AgentThread(_) | VisibleSurface::Terminal(_)
+        ) && self.has_open_project(cx)
+            && !self.is_title_editor_focused(window, cx)
+    }
+
     fn render_title_view(&self, window: &mut Window, cx: &Context<Self>) -> AnyElement {
         let content = match self.visible_surface() {
             VisibleSurface::AgentThread(conversation_view) => {
@@ -4096,11 +4104,7 @@ impl AgentPanel {
             .max_w_full()
             .overflow_x_hidden()
             .child(content)
-            .when(
-                matches!(self.visible_surface(), VisibleSurface::AgentThread(_))
-                    && self.has_open_project(cx)
-                    && !self.is_title_editor_focused(window, cx),
-                |this| {
+            .when(self.should_show_title_edit(window, cx), |this| {
                 this.child(gradient_overlay).child(
                     h_flex()
                         .visible_on_hover("title_editor")
@@ -4114,8 +4118,7 @@ impl AgentPanel {
                                 .tooltip(Tooltip::text("Edit Thread Title")),
                         ),
                 )
-                },
-            )
+            })
             .into_any()
     }
 
@@ -6824,6 +6827,42 @@ mod tests {
         });
     }
 
+    #[gpui::test]
+    async fn test_title_edit_affordance_matches_threads_and_terminals(cx: &mut TestAppContext) {
+        let (panel, mut cx) = setup_panel(cx).await;
+
+        panel.update_in(&mut cx, |panel, window, cx| {
+            panel.activate_draft(false, AgentThreadSource::AgentPanel, window, cx);
+        });
+        cx.run_until_parked();
+
+        panel.update_in(&mut cx, |panel, window, cx| {
+            assert!(matches!(
+                panel.visible_surface(),
+                VisibleSurface::AgentThread(_)
+            ));
+            assert!(panel.should_show_title_edit(window, cx));
+        });
+
+        let terminal_id = panel
+            .update_in(&mut cx, |panel, window, cx| {
+                panel.insert_test_terminal("Dev Server", true, window, cx)
+            })
+            .expect("test terminal should be inserted");
+        cx.run_until_parked();
+
+        panel.update_in(&mut cx, |panel, window, cx| {
+            assert!(matches!(
+                panel.visible_surface(),
+                VisibleSurface::Terminal(_)
+            ));
+            assert!(panel.should_show_title_edit(window, cx));
+
+            panel.edit_terminal_title(terminal_id, window, cx);
+            assert!(!panel.should_show_title_edit(window, cx));
+        });
+    }
+
     #[gpui::test]
     async fn test_terminal_working_directory_uses_active_workspace_while_workspace_is_updating(
         cx: &mut TestAppContext,