Ensure all statuses are cached before returning

Tusker/Screens/Timeline/TimelineViewController.swift

@@ -353,16 +353,24 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
         guard !unloaded.isEmpty else {
             return
         }
-        await withTaskGroup(of: Void.self) { group in
+        let statuses = await withTaskGroup(of: Status?.self) { group -> [Status] in
             for id in unloaded {
                 group.addTask { @MainActor in
                     if let (status, _) = try? await self.mastodonController.run(Client.getStatus(id: id)) {
-                        self.mastodonController.persistentContainer.addOrUpdate(status: status)
+                        return status
+                    } else {
+                        return nil
                     }
                 }
             }
+            return await group.reduce(into: []) { partialResult, status in
+                if let status {
+                    partialResult.append(status)
                 }
             }
+        }
+        await mastodonController.persistentContainer.addAll(statuses: statuses)
+    }
     
     private func applyItemsToRestore(position: TimelinePosition) {
         var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()