rebuild_queue: dashboard panel + snapshot field + SSE event wireup

hive-c0re/src/dashboard.rs

@@ -237,6 +237,12 @@ struct StateSnapshot {
     /// disabled "updating…" state; live transitions arrive via the
     /// `MetaUpdateRunning` event (issue #259).
     meta_update_running: bool,
+    /// Current state of the global rebuild queue — pending + running
+    /// long-lived ops (rebuild / meta-update / spawn) plus the most
+    /// recent few terminal entries the queue retains for history.
+    /// Live transitions arrive via the `RebuildQueueChanged` event.
+    /// See `rebuild_queue.rs`.
+    rebuild_queue: Vec<crate::rebuild_queue::QueueEntry>,
     /// Whether the hive-forge container is up. When true the dashboard
     /// links each container's config + each approval's commit into the
     /// forge's `agent-configs` repos.
@@ -431,6 +437,7 @@ async fn api_state(headers: HeaderMap, State(state): State<AppState>) -> axum::J
         question_history,
         tombstones,
         port_conflicts,
+        rebuild_queue: state.coord.rebuild_queue.snapshot(),
         forge_present: crate::forge::is_present().await,
     })
 }