implemented a guided notification permission flow triggered on the first Talk visit

lib/utils/downloads/download_manager.dart

@@ -91,15 +91,11 @@ class DownloadManager {
       tapOpensFile: false,
     );
 
-    // Notification permission is normally already granted via the FCM flow at
-    // login; request best-effort so downloads on a fresh install still notify.
-    try {
-      await bd.FileDownloader().permissions.request(
-        bd.PermissionType.notifications,
-      );
-    } on Object catch (e) {
-      debugPrint('DownloadManager: notification permission request failed: $e');
-    }
+    // Deliberately no notification-permission request here: it would fire the
+    // OS prompt at cold start (before login), which is exactly what we moved
+    // into the guided first-Talk-visit flow (see maybePromptTalkNotifications).
+    // Downloads still work without it; their progress notifications simply
+    // appear once the same POST_NOTIFICATIONS permission is granted there.
   }
 
   /// Active or recently finished job for [remotePath], or null if none.