assistant2: Make context pills clickable (#27680)

Release Notes:

- N/A

crates/assistant2/src/ui/context_pill.rs

@@ -162,7 +162,9 @@ impl RenderOnce for ContextPill {
                 })
                 .when_some(on_click.as_ref(), |element, on_click| {
                     let on_click = on_click.clone();
-                    element.on_click(move |event, window, cx| on_click(event, window, cx))
+                    element
+                        .cursor_pointer()
+                        .on_click(move |event, window, cx| on_click(event, window, cx))
                 }),
             ContextPill::Suggested {
                 name,