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

lib/push/push_status.dart

@@ -160,7 +160,16 @@ class PushStatusRow {
   /// for informational details (e.g. the registered URL).
   final String? detail;
 
-  const PushStatusRow({required this.label, required this.state, this.detail});
+  /// When true, the row offers a shortcut into the OS notification settings —
+  /// the only place the user can (re)grant the permission after a denial.
+  final bool opensNotificationSettings;
+
+  const PushStatusRow({
+    required this.label,
+    required this.state,
+    this.detail,
+    this.opensNotificationSettings = false,
+  });
 }
 
 const _pendingDetail =
@@ -181,6 +190,7 @@ List<PushStatusRow> buildPushStatusRows(PushStatusReport r) => [
   PushStatusRow(
     label: 'Benachrichtigungsberechtigung',
     state: r.osPermission,
+    opensNotificationSettings: true,
     detail: switch (r.osPermission) {
       PushCheck.ok => null,
       PushCheck.fail =>