feat: enhance responsiveness by implementing abort checks in streaming API calls

src/app/workflow/engine.rs

@@ -237,7 +237,7 @@ fn spawn_single_agent(
         let _ = done_tx.send(run_subagent(&bg_ctx, &bg_tx));
     });
 
-    let poll_interval = Duration::from_millis(500);
+    let poll_interval = Duration::from_millis(200);
     let result = if let Some(timeout) = timeout_ms {
         let deadline = Duration::from_millis(timeout);
         let mut elapsed = Duration::ZERO;