dashboard: msgflow uses shared terminal + backfill via /messages/history

hive-c0re/src/dashboard.rs

@@ -59,6 +59,8 @@ pub async fn serve(port: u16, coord: Arc<Coordinator>) -> Result<()> {
         .route("/op-send", post(post_op_send))
         .route("/meta-update", post(post_meta_update))
         .route("/messages/stream", get(messages_stream))
+        .route("/messages/history", get(messages_history))
+        .route("/static/hive-fr0nt.js", get(serve_shared_js))
         .with_state(AppState { coord });
     let addr = SocketAddr::from(([0, 0, 0, 0], port));
     let listener = bind_with_retry(addr).await?;
@@ -133,6 +135,13 @@ async fn serve_app_js() -> impl IntoResponse {
     )
 }
 
+async fn serve_shared_js() -> impl IntoResponse {
+    (
+        [("content-type", "application/javascript")],
+        hive_fr0nt::TERMINAL_JS,
+    )
+}
+
 #[derive(Serialize)]
 struct StateSnapshot {
     hostname: String,
@@ -699,6 +708,23 @@ fn dir_size_bytes(root: &Path) -> u64 {
     total
 }
 
+async fn messages_history(State(state): State<AppState>) -> Response {
+    // Backfill source for the dashboard message-flow terminal. Returns
+    // up to ~200 historical broker messages as `MessageEvent::Sent` JSON
+    // — same shape as the live `/messages/stream`, so the renderer
+    // doesn't branch on history vs. live.
+    const HISTORY_LIMIT: u64 = 200;
+    match state.coord.broker.recent_all(HISTORY_LIMIT) {
+        Ok(mut events) => {
+            // recent_all returns newest-first; reverse so the replay
+            // builds chronologically (matches the agent /events/history).
+            events.reverse();
+            axum::Json(events).into_response()
+        }
+        Err(e) => error_response(&format!("messages/history failed: {e:#}")),
+    }
+}
+
 async fn messages_stream(
     State(state): State<AppState>,
 ) -> Sse<impl Stream<Item = Result<Event, Infallible>>> {