Add the announcement of switched workspaces from Niri.

I haven't tested this with Braille support; I don't remember what I did with the cable.

internal/app/event_accessibility.go

@@ -110,6 +110,13 @@ func (handler *accessibilityEventHandler) handle(event atspi.Event) {
 			"selection_start", event.Source.SelectionStart,
 			"selection_end", event.Source.SelectionEnd)
 	}
+	if event.Type == atspi.AnnouncementEvent {
+		// Announcements are explicit requests to speak from providers that
+		// may never own focus or the foreground window. Present them before
+		// any ownership gating, and never let them move focus state.
+		handler.presentAnnouncement(event)
+		return
+	}
 	syncForeground()
 	if handler.handle_window_switcher(event) {
 		return