FIX: liên tục mở tab browser trên exe

src-tauri/src/lib.rs

@@ -20,14 +20,19 @@ pub fn run() {
         })
         .on_window_event(|window, event| {
             if let tauri::WindowEvent::Destroyed = event {
-                // 2. Terminate sidecar process when DAW window is destroyed
+                // 2. Terminate sidecar khi window đóng — kill CẢ TREE (PyInstaller
+                // onefile = parent + child — child.kill() chỉ giết parent → child
+                // orphan chạy mãi — bug 09:30). taskkill /T giết cả nhánh.
                 let state = window.state::<EngineProcess>();
                 if let Ok(mut lock) = state.0.lock() {
                     if let Some(child) = lock.take() {
                         let _ = child.kill();
-                        println!("daw_engine sidecar terminated gracefully.");
                     }
                 };
+                let _ = std::process::Command::new("taskkill")
+                    .args(["/F", "/T", "/IM", "daw_engine.exe"])
+                    .output();
+                println!("daw_engine sidecar terminated (tree killed).");
             }
         })
         .run(tauri::generate_context!())