T10a feedback: toasts with undo and a hover-held clock, notifications and their center, alert, banner, callout, inline and status messages, empty state; root focus scopes take lost focus

examples/gallery/shell.rs

@@ -199,6 +199,7 @@ impl Render for Gallery {
         let colors = &theme.colors;
 
         FocusScope::new(&self.focus)
+            .root()
             .size_full()
             .flex()
             .bg(colors.bg)