simplified code across the app and consolidated duplicated helpers

lib/widget/downloads/download_tray.dart

@@ -5,7 +5,6 @@ import 'package:flutter/material.dart';
 import '../../routing/app_routes.dart';
 import '../../utils/downloads/download_job.dart';
 import '../../utils/downloads/download_manager.dart';
-import '../../utils/haptics.dart';
 import 'downloads_sheet.dart';
 import 'stale_download_guard.dart';
 
@@ -204,10 +203,7 @@ class _DownloadTrayHostState extends State<DownloadTrayHost>
       _manager.markOpened(job);
       return;
     }
-    if (!ensureDownloadStillExists(ctx, job)) return;
-    _manager.markOpened(job);
-    Haptics.success();
-    AppRoutes.openFileViewer(ctx, path, remoteFile: job.remoteFile);
+    openFinishedDownload(ctx, job, path);
   }
 
   /// Distance from the bottom to float the chip. Anchored bottom-LEFT (FABs are