feat: add event support for window urgency

daemon/manager.rs

@@ -434,7 +434,15 @@ impl NiriTag {
                 }
                 Ok(())
             }
-            // WindowUrgencyChanged { .. } => (),
+            WindowUrgencyChanged { id, urgent } => {
+                if let Some(&t) = self.windows.get(&id) {
+                    // could potentially overwrite urgent conditions on multiple windows in the same tag
+                    // but the tag concern has been raised, at least
+                    self.tags.entry(t).and_modify(|ts| ts.urgent = urgent);
+                    self.fire_event(TagEvent::TagUrgent(t)).await;
+                }
+                Ok(())
+            }
             _ => Ok(()),
         }
     }