fix(startup): use tauri::async_runtime::spawn for pre-warm — tokio::spawn panics before runtime is live in setup()

src-tauri/src/commands/models.rs

@@ -175,8 +175,8 @@ pub fn prewarm_default_model(whisper_engine: Arc<LocalEngine>) {
         return;
     }
 
-    tokio::spawn(async move {
-        let result = tokio::task::spawn_blocking(move || {
+    tauri::async_runtime::spawn(async move {
+        let result = tauri::async_runtime::spawn_blocking(move || {
             load_model_from_disk(&model_id).map(|model| {
                 whisper_engine.load(model, model_id);
             })