fix(desktop): add missing StoreExt import and fix unused mut warning (#7707)

packages/desktop/src-tauri/src/lib.rs

@@ -302,6 +302,7 @@ pub fn run() {
                 .unwrap_or(LogicalSize::new(1920, 1080));
 
             // Create window immediately with serverReady = false
+            #[allow(unused_mut)]
             let mut window_builder =
                 WebviewWindow::builder(&app, "main", WebviewUrl::App("/".into()))
                     .title("OpenCode")