breadcrumbs: Update multibuffer to match singleton (#28267)

Before:


https://github.com/user-attachments/assets/a2c8fe84-14f6-4cda-b51a-5ada3e2523b6

After:


https://github.com/user-attachments/assets/559bcfe8-a40f-44cc-a626-b0544b6cea68



Release Notes:

- N/A

crates/breadcrumbs/src/breadcrumbs.rs

@@ -131,8 +131,9 @@ impl Render for Breadcrumbs {
                     }),
             ),
             None => element
-                // Match the height of the `ButtonLike` in the other arm.
+                // Match the height and padding of the `ButtonLike` in the other arm.
                 .h(rems_from_px(22.))
+                .pl_1()
                 .child(breadcrumbs_stack),
         }
     }