refactor(#1825): remove dead manager_port field from dashboard snapshot

hive-c0re/src/dashboard.rs

@@ -26,7 +26,7 @@ use tokio_stream::{Stream, StreamExt};
 
 use crate::container_view::{ContainerView, claude_has_session};
 use crate::coordinator::Coordinator;
-use crate::lifecycle::{self, MANAGER_NAME};
+use crate::lifecycle;
 use chrono::{DateTime, Utc};
 
 mod approvals;
@@ -266,7 +266,6 @@ struct StateSnapshot {
     /// "apply everything you've buffered".
     seq: u64,
     hostname: String,
-    manager_port: u16,
     any_stale: bool,
     containers: Vec<ContainerView>,
     transients: Vec<TransientView>,
@@ -597,7 +596,6 @@ async fn api_state(headers: HeaderMap, State(state): State<AppState>) -> axum::J
     axum::Json(StateSnapshot {
         seq,
         hostname,
-        manager_port: lifecycle::agent_web_port(MANAGER_NAME),
         any_stale,
         containers,
         transients,