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

src/primitives/icon.rs

@@ -205,6 +205,7 @@ icons! {
     Save => "save",
     Scissors => "scissors",
     Search => "search",
+    SearchX => "search-x",
     Send => "send",
     Server => "server",
     Settings => "settings",