feat(startup): pre-warm default Whisper model at launch in background thread

src-tauri/src/lib.rs

@@ -215,6 +215,11 @@ pub fn run() {
                 db,
             });
 
+            {
+                let whisper = app.state::<AppState>().whisper_engine.clone();
+                crate::commands::models::prewarm_default_model(whisper);
+            }
+
             if let Err(e) = tray::setup(app) {
                 eprintln!("Failed to setup tray: {e}");
             }