feat(dashboard): extract inline script to standalone dashboard.ts/js, add UI build/check recipes, and add route unit tests

nvim-core/src/lib.rs

@@ -385,19 +385,6 @@ async fn get_nvim_connection() -> Result<mpsc::Sender<NvimRequest>, String> {
         }
     });
 
-    // Cleanup task for timed-out requests
-    let pending_clone3 = Arc::clone(&pending_requests);
-    tokio::spawn(async move {
-        let mut interval = tokio::time::interval(tokio::time::Duration::from_secs(10));
-        loop {
-            interval.tick().await;
-            if Arc::strong_count(&pending_clone3) <= 1 {
-                break; // Socket closed and other tasks finished, no need to keep cleaning up
-            }
-            pending_clone3.retain(|_, sender| !sender.is_closed());
-        }
-    });
-
     let mut conn_lock = NVIM_CONN.lock().unwrap_or_else(|e| e.into_inner());
     if let Some(existing_sender) = conn_lock.as_ref()
         && !existing_sender.is_closed()