[refactor] remove unused UI provider

Author: opxdelwin

lib/providers/ui_providers.dart

@@ -3,7 +3,6 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 final navRailIndexStateProvider = StateProvider<int>((ref) => 0);
 final selectedIdEditStateProvider = StateProvider<String?>((ref) => null);
-final sentRequestIdStateProvider = StateProvider<String?>((ref) => null);
 final codePaneVisibleStateProvider = StateProvider<bool>((ref) => false);
 final saveDataStateProvider = StateProvider<bool>((ref) => false);
 final clearDataStateProvider = StateProvider<bool>((ref) => false);