fix(account): 本地化网络异常文案

test/support/fake_account_repository.dart

@@ -68,10 +68,12 @@ class FakeAccountRepository implements AccountRepository {
   bool failUpdate = false;
   bool failDeactivate = false;
   bool failCancel = false;
+  bool throwUnexpected = false;
 
   @override
   Future<AccountProfile> profile() async {
     profileCalls++;
+    if (throwUnexpected) throw StateError('offline');
     if (failProfile) throw const ApiException(500, '资料加载失败');
     return _profile;
   }
@@ -79,6 +81,7 @@ class FakeAccountRepository implements AccountRepository {
   @override
   Future<AccountProfile> updateProfile(AccountProfileUpdate update) async {
     lastUpdate = update;
+    if (throwUnexpected) throw StateError('offline');
     if (failUpdate) throw const ApiException(400, '昵称不可用');
     _profile = AccountProfile(
       uid: _profile.uid,
@@ -100,6 +103,7 @@ class FakeAccountRepository implements AccountRepository {
   @override
   Future<List<AccountDevice>> devices() async {
     deviceCalls++;
+    if (throwUnexpected) throw StateError('offline');
     if (failDevices) throw const ApiException(500, '设备加载失败');
     return [..._devices];
   }
@@ -107,6 +111,7 @@ class FakeAccountRepository implements AccountRepository {
   @override
   Future<AccountExport> export() async {
     exportCalls++;
+    if (throwUnexpected) throw StateError('offline');
     if (failExport) throw const ApiException(500, '导出失败');
     return _export;
   }