fix(splash): distinguish network errors from auth errors in session check

modules/splash/lib/src/domain/check_session_use_case_impl.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:sf_infrastructure/sf_infrastructure.dart';
 import 'package:sf_shared/sf_shared.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
@@ -28,6 +29,10 @@ class CheckSessionUseCaseImpl implements CheckSessionUseCase {
     try {
       await _userRepository.getUserInfo();
     } catch (e) {
+      if (e is ApiException && e.isNetworkError) {
+        debugPrint('[CheckSession] network error, assuming valid session: $e');
+        return InitialRoute.home;
+      }
       debugPrint('[CheckSession] no session: $e');
       return InitialRoute.login;
     }
@@ -40,7 +45,7 @@ class CheckSessionUseCaseImpl implements CheckSessionUseCase {
       }
     } catch (e) {
       debugPrint('[CheckSession] devices check failed: $e');
-      return InitialRoute.deviceSetup;
+      return InitialRoute.home;
     }
 
     debugPrint('[CheckSession] → home');

packages/sf_shared/lib/src/data/datasource/user_remote_datasource_impl.dart

@@ -25,11 +25,7 @@ class UserRemoteDatasourceImpl implements UserRemoteDatasource {
       final parsed = UserResponseModel.fromJson(data);
       return parsed.item;
     } on DioException catch (error) {
-      final apiMsg = error.response?.data;
-      final msg = apiMsg is String
-          ? apiMsg
-          : (error.message ?? 'Error in /auth/me');
-      throw Exception(msg);
+      throw mapDioError(error, defaultMessage: 'Error in /auth/me');
     }
   }