fix: ensure system info is loaded before MainShell builds (#1105)

CallerIdSettingsRepository.create and another provider create: in main_shell.dart
call getLocalSystemInfo() synchronously. If system info is absent (cleared during
session cleanup after FGS failure, or never fetched in this session) the provider
throws StateError and crashes the app.

Add a getSystemInfo(cacheFirst) call to onMainShellRouteGuardNavigation, executed
after the auth check and before navigation resolves. If system info cannot be
loaded — no cache and network unreachable — redirect to the login screen.

This prevents the crash observed on Xiaomi after FGS recovery:
  CallerIdSettingsRepository.create → getLocalSystemInfo() → StateError:
  "No system info in cache" (main_shell.dart:257)

Author: SERDUN

lib/app/router/app_router.dart

@@ -11,6 +11,7 @@ import 'package:webtrit_phone/blocs/app/app_bloc.dart';
 import 'package:webtrit_phone/data/data.dart';
 import 'package:webtrit_phone/features/features.dart';
 import 'package:webtrit_phone/models/models.dart';
+import 'package:webtrit_phone/repositories/repositories.dart';
 import 'package:webtrit_phone/resolvers/resolvers.dart';
 
 import 'deeplinks.dart';
@@ -27,6 +28,7 @@ class AppRouter extends RootStackRouter {
   AppRouter(
     this._appBloc,
     this._appPermissions,
+    this._systemInfoRepository,
     EmbeddedData? launchEmbeddedData,
     BottomMenuConfig bottomMenuFeature,
     InitialTabResolver initialTabResolver,
@@ -40,6 +42,7 @@ class AppRouter extends RootStackRouter {
 
   final AppBloc _appBloc;
   final AppPermissions _appPermissions;
+  final SystemInfoRepository _systemInfoRepository;
 
   late EmbeddedData? _launchEmbeddedData;
   late BottomMenuConfig _bottomMenuFeature;
@@ -340,6 +343,25 @@ class AppRouter extends RootStackRouter {
       return;
     }
 
+    // Ensure system info is in cache before MainShell builds.
+    // Several provider create: callbacks call getLocalSystemInfo() synchronously;
+    // without this guard the app crashes if system info was cleared (e.g. during
+    // session cleanup after an FGS failure) or was never fetched in this session.
+    try {
+      final systemInfo = await _systemInfoRepository.getSystemInfo(fetchPolicy: FetchPolicy.cacheFirst);
+      if (systemInfo == null) {
+        _logger.warning('onMainShellRouteGuardNavigation: system info unavailable, redirecting to login');
+        resolver.next(false);
+        router.replaceAll([LoginRouterPageRoute(launchEmbeddedData: _launchEmbeddedData)]);
+        return;
+      }
+    } catch (e, s) {
+      _logger.severe('onMainShellRouteGuardNavigation: failed to load system info', e, s);
+      resolver.next(false);
+      router.replaceAll([LoginRouterPageRoute(launchEmbeddedData: _launchEmbeddedData)]);
+      return;
+    }
+
     // Enforce mandatory legal agreements and system permissions.
     final contactsSourceTypes = _bottomMenuFeature.getTabEnabled<ContactsBottomMenuTab>()?.contactSourceTypes;
     final isLocalContactsEnabled = contactsSourceTypes?.contains(ContactSourceType.local) ?? false;

lib/app/view/app.dart

@@ -69,6 +69,7 @@ class _AppState extends State<App> {
     appRouter = AppRouter(
       appBloc,
       context.read<AppPermissions>(),
+      context.read<SystemInfoRepository>(),
       featureAccess.loginConfig.launchLoginPage,
       featureAccess.bottomMenuConfig,
       initialTabResolver,