fix(#1643): filter destroyed-agent targets from dashboard schedule view

hive-c0re/src/actions.rs

@@ -696,6 +696,10 @@ pub async fn destroy(coord: &Arc<Coordinator>, name: &str, purge: bool) -> Resul
     // purge — recompute either way).
     coord.rescan_containers_and_emit().await;
     crate::dashboard::emit_tombstones_snapshot(coord).await;
+    // Re-emit the schedules snapshot: the rescan above refreshed the live
+    // roster, so any schedule that still targets the just-destroyed agent
+    // now drops that ghost column live (no page reload needed).
+    coord.emit_schedules_snapshot();
     Ok(())
 }