Insert Reference panel: one Attach, labelled underlay tools, slide-out with Edit Reference and xref fading

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/ui/ribbon/widgets.rs

@@ -665,7 +665,15 @@ pub(super) fn render_small<'a>(
                 items.iter().find(|(candidate, _, _)| *candidate == cmd)
                     .map(|(_, _, item_icon)| *item_icon)
             }).or_else(|| items.first().map(|(_, _, item_icon)| *item_icon)).unwrap_or(*icon);
-            let localized_label = t!(*label).into_owned();
+            let localized_label = if label.is_empty() {
+                items
+                    .iter()
+                    .find(|(cmd, _, _)| *cmd == last)
+                    .map(|(_, item_label, _)| t!(*item_label).into_owned())
+                    .unwrap_or_default()
+            } else {
+                t!(*label).into_owned()
+            };
             let face = row![
                 container(make_icon(cur_icon, SMALL_ICON)).width(Length::Fixed(SMALL_W)),
                 text(localized_label.clone()).size(10).wrapping(advanced_text::Wrapping::None),