Move remaining download filesystem work off the GTK thread

src/application.rs

@@ -157,7 +157,10 @@ async fn intake_remote_torrent(
             Routed::OpenedCard
         }
         Ok(_) => {
-            if let Err(e) = manager.enqueue_torrent_file(bytes, &stem, None, None) {
+            if let Err(e) = manager
+                .enqueue_torrent_file_async(bytes, &stem, None, None)
+                .await
+            {
                 fail(e);
                 return Routed::Failed;
             }
@@ -560,8 +563,9 @@ fn handle_open_files(s: Rc<State>, files: Vec<gio::File>) {
                                 add_card.open_torrent_picker(file_name, bytes, entries);
                             }
                             Ok(_) => {
-                                if let Err(e) =
-                                    manager.enqueue_torrent_file(bytes, &stem, None, None)
+                                if let Err(e) = manager
+                                    .enqueue_torrent_file_async(bytes, &stem, None, None)
+                                    .await
                                 {
                                     toasts.add_toast(adw::Toast::new(&crate::ui_util::esc_markup(
                                         &e,

src/download_store.rs

@@ -89,7 +89,7 @@ pub(crate) struct StoredItem {
     pub(crate) gallery: Option<serde_json::Value>,
 }
 
-#[derive(Debug, serde::Serialize, serde::Deserialize)]
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
 pub(crate) struct StoredQueue {
     pub(crate) version: u32,
     pub(crate) items: Vec<StoredItem>,