Add context menu previews to explore VC

Tusker/Screens/Explore/ExploreViewController.swift

@@ -238,6 +238,33 @@ class ExploreViewController: EnhancedTableViewController {
         return .delete
     }
     
+    override func tableView(_ tableView: UITableView, contextMenuConfigurationForRowAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
+        switch dataSource.itemIdentifier(for: indexPath) {
+        case .bookmarks:
+            return UIContextMenuConfiguration(identifier: nil, previewProvider: {
+                return BookmarksTableViewController(mastodonController: self.mastodonController)
+            }, actionProvider: nil)
+            
+        case let .list(list):
+            return UIContextMenuConfiguration(identifier: nil, previewProvider: {
+                return ListTimelineViewController(for: list, mastodonController: self.mastodonController)
+            }, actionProvider: nil)
+            
+        case let .savedHashtag(hashtag):
+            return UIContextMenuConfiguration(identifier: nil, previewProvider: {
+                return HashtagTimelineViewController(for: hashtag, mastodonController: self.mastodonController)
+            }, actionProvider: nil)
+            
+        case let .savedInstance(url):
+            return UIContextMenuConfiguration(identifier: nil, previewProvider: {
+                return InstanceTimelineViewController(for: url, parentMastodonController: self.mastodonController)
+            }, actionProvider: nil)
+            
+        default:
+            return nil
+        }
+    }
+    
 }
 
 extension ExploreViewController {