cleanup(#1014): remove is_manager from ContainerView, add manager_name to StateSnapshot

hive-c0re/src/dashboard.rs

@@ -173,6 +173,9 @@ struct StateSnapshot {
     /// "apply everything you've buffered".
     seq: u64,
     hostname: String,
+    /// The logical name of the manager agent. Lets the dashboard identify
+    /// the manager container without a separate `is_manager` bool on each row.
+    manager_name: String,
     manager_port: u16,
     any_stale: bool,
     containers: Vec<ContainerView>,
@@ -446,6 +449,7 @@ async fn api_state(headers: HeaderMap, State(state): State<AppState>) -> axum::J
     axum::Json(StateSnapshot {
         seq,
         hostname,
+        manager_name: MANAGER_NAME.to_owned(),
         manager_port: lifecycle::agent_web_port(MANAGER_NAME),
         any_stale,
         containers,