added support for multiple accounts with an account switcher in settings

lib/storage/hydrated_storage_bootstrap.dart

@@ -9,19 +9,43 @@ import 'package:hydrated_bloc/hydrated_bloc.dart';
 Future<Storage> buildHydratedStorageWithFallback(String directoryPath) async {
   final directory = HydratedStorageDirectory(directoryPath);
   try {
-    return await HydratedStorage.build(storageDirectory: directory);
+    return await _build(directory);
   } catch (e, s) {
     log('HydratedStorage open failed, rebuilding: $e', stackTrace: s);
   }
   try {
     await _deleteHydratedBox(directoryPath);
-    return await HydratedStorage.build(storageDirectory: directory);
+    return await _build(directory);
   } catch (e, s) {
     log('HydratedStorage rebuild failed, using memory: $e', stackTrace: s);
     return InMemoryStorage();
   }
 }
 
+final Expando<List<String> Function()> _keyReaders = Expando();
+
+Future<Storage> _build(HydratedStorageDirectory directory) async {
+  final storage = await HydratedStorage.build(storageDirectory: directory);
+  // hydrated_bloc exposes no key listing; the Hive instance is the only way
+  // in. Every build replaces the static one, so it is captured per storage.
+  // ignore: invalid_use_of_visible_for_testing_member
+  final hive = HydratedStorage.hive;
+  _keyReaders[storage] = () =>
+      hive.box<dynamic>('hydrated_box').keys.map((k) => '$k').toList();
+  return storage;
+}
+
+/// All keys persisted in [storage], sorted; `null` when they can't be
+/// enumerated.
+List<String>? hydratedStorageKeys(Storage storage) {
+  if (storage is InMemoryStorage) return storage.keys.toList()..sort();
+  try {
+    return _keyReaders[storage]?.call()?..sort();
+  } on Object {
+    return null;
+  }
+}
+
 Future<void> _deleteHydratedBox(String directoryPath) async {
   final directory = Directory(directoryPath);
   if (!directory.existsSync()) return;