Fixes for PostHog

frontend/pshared/lib/provider/account.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 
 import 'package:share_plus/share_plus.dart';
@@ -20,6 +22,9 @@ import 'package:pshared/utils/exception.dart';
 
 
 class AccountProvider extends ChangeNotifier {
+  AccountProvider({Future<void> Function(Account?)? onAccountChanged})
+      : _onAccountChanged = onAccountChanged;
+
   static String get currentUserRef => Constants.nilObjectRef;
 
   // The resource now wraps our Account? state along with its loading/error state.
@@ -27,6 +32,8 @@ class AccountProvider extends ChangeNotifier {
   Resource<Account?> get resource => _resource;
   late LocaleProvider _localeProvider;
   PendingLogin? _pendingLogin;
+  Future<void>? _restoreFuture;
+  Future<void> Function(Account?)? _onAccountChanged;
 
   Account? get account => _resource.data;
   PendingLogin? get pendingLogin => _pendingLogin;
@@ -53,11 +60,21 @@ class AccountProvider extends ChangeNotifier {
   }
 
   // Private helper to update the resource and notify listeners.
+  void setAccountChangedListener(Future<void> Function(Account?)? listener) => _onAccountChanged = listener;
+
   void _setResource(Resource<Account?> newResource) {
+    final previousAccount = _resource.data;
     _resource = newResource;
+    _notifyAccountChanged(previousAccount, newResource.data);
     notifyListeners();
   }
 
+  void _notifyAccountChanged(Account? previous, Account? current) {
+    if (previous == current) return;
+    final handler = _onAccountChanged;
+    if (handler != null) unawaited(handler(current));
+  }
+
   void updateProvider(LocaleProvider localeProvider) => _localeProvider = localeProvider; 
 
   void _pickupLocale(String locale) => _localeProvider.setLocale(Locale(locale));
@@ -220,4 +237,11 @@ class AccountProvider extends ChangeNotifier {
       rethrow;
     }
   }
+
+  Future<void> restoreIfPossible() {
+    return _restoreFuture ??= AuthorizationService.isAuthorizationStored().then<void>((hasAuth) async {
+      if (!hasAuth) return;
+      await restore();
+    });
+  }
 }