diff --git a/client/lib/screens/finance/finance_screen.dart b/client/lib/screens/finance/finance_screen.dart
index 8a8290a..0f356b1 100644
--- a/client/lib/screens/finance/finance_screen.dart
+++ b/client/lib/screens/finance/finance_screen.dart
@@ -11,7 +11,7 @@ import '../../widgets/page_scaffold.dart';
 import '../../providers/connectivity_provider.dart';
 import '../../core/utils/export_util.dart';
 import '../../repositories/finance_repository.dart';
-import '../../core/auth/auth_state.dart';
+import '../../widgets/write_guard.dart';
 
 class FinanceScreen extends ConsumerWidget {
   const FinanceScreen({super.key});
@@ -161,7 +161,7 @@ class _FinanceTabState extends ConsumerState<_FinanceTab> {
           MobileCardField('状态', null, valueWidget: _StatusBadge(r.status)),
         if (r.remark?.isNotEmpty == true) MobileCardField('备注', r.remark),
       ],
-      actions: (canClose && !ref.watch(isReadonlyProvider))
+      actions: (canClose && !WriteGuard.isReadonly(ref))
           ? [
               TextButton(
                 onPressed: () => _closeRecord(r),
@@ -307,7 +307,7 @@ class _FinanceTabState extends ConsumerState<_FinanceTab> {
         case 'actions':
           if ((r.type == 'payable' || r.type == 'receivable') &&
               r.status == 'open' &&
-              !ref.watch(isReadonlyProvider)) {
+              !WriteGuard.isReadonly(ref)) {
             return DataCell(TextButton(
               onPressed: () => _closeRecord(r),
               child: const Text('结清',
@@ -408,13 +408,13 @@ class _FinanceTabState extends ConsumerState<_FinanceTab> {
             },
             toolbar: Row(
               children: [
-                if (addLabel != null && !ref.watch(isReadonlyProvider))
+                if (addLabel != null && !WriteGuard.isReadonly(ref))
                   ElevatedButton.icon(
                     onPressed: _showAddDialog,
                     icon: const Icon(Icons.add, size: 16),
                     label: Text(addLabel),
                   ),
-                if (addLabel != null && !ref.watch(isReadonlyProvider))
+                if (addLabel != null && !WriteGuard.isReadonly(ref))
                   const SizedBox(width: 8),
                 OutlinedButton.icon(
                   onPressed: () {
diff --git a/client/lib/screens/inventory/inventory_list_screen.dart b/client/lib/screens/inventory/inventory_list_screen.dart
index a98c877..b79ed85 100644
--- a/client/lib/screens/inventory/inventory_list_screen.dart
+++ b/client/lib/screens/inventory/inventory_list_screen.dart
@@ -9,6 +9,7 @@ import '../../core/responsive/responsive.dart';
 import '../../core/theme/app_theme.dart';
 import '../../models/inventory.dart';
 import '../../core/auth/auth_state.dart';
+import '../../widgets/write_guard.dart';
 import '../../providers/inventory_provider.dart';
 import '../../widgets/data_table_card.dart';
 import '../../widgets/mobile_list_card.dart';
@@ -292,7 +293,7 @@ class _InventoryListScreenState extends ConsumerState<InventoryListScreen> {
           message: item.remark.isEmpty ? '' : item.remark,
           waitDuration: const Duration(milliseconds: 300),
           child: GestureDetector(
-            onTap: ref.watch(isReadonlyProvider)
+            onTap: WriteGuard.isReadonly(ref)
                 ? null
                 : () => _editRemark(context, item),
             child: Row(
@@ -360,7 +361,7 @@ class _InventoryListScreenState extends ConsumerState<InventoryListScreen> {
           MobileCardField('供应商', item.supplierName),
       ],
       actions: [
-        if (!ref.watch(isReadonlyProvider))
+        if (!WriteGuard.isReadonly(ref))
           TextButton(
             onPressed: () => _editRemark(context, item),
             child: const Text('备注', style: TextStyle(fontSize: 13)),
@@ -554,7 +555,7 @@ class _InventoryListScreenState extends ConsumerState<InventoryListScreen> {
                     ref.read(inventoryListProvider.notifier).setPageSize(s),
                 toolbar: Row(
                   children: [
-                    if (!ref.watch(isReadonlyProvider)) ...[
+                    if (!WriteGuard.isReadonly(ref)) ...[
                       OutlinedButton.icon(
                         onPressed: () => context.go('/inventory/check'),
                         icon: const Icon(Icons.fact_check, size: 16),
diff --git a/client/lib/screens/partners/partners_screen.dart b/client/lib/screens/partners/partners_screen.dart
index 7ae165e..ce13862 100644
--- a/client/lib/screens/partners/partners_screen.dart
+++ b/client/lib/screens/partners/partners_screen.dart
@@ -11,7 +11,7 @@ import '../../widgets/data_table_card.dart';
 import '../../widgets/mobile_list_card.dart';
 import '../../widgets/page_scaffold.dart';
 import '../../core/utils/export_util.dart';
-import '../../core/auth/auth_state.dart';
+import '../../widgets/write_guard.dart';
 
 class PartnersScreen extends ConsumerStatefulWidget {
   const PartnersScreen({super.key});
@@ -167,7 +167,7 @@ class _PartnersScreenState extends ConsumerState<PartnersScreen> {
           if (p.phone?.isNotEmpty == true) MobileCardField('电话', p.phone),
           if (p.address?.isNotEmpty == true) MobileCardField('地址', p.address),
         ],
-        actions: ref.watch(isReadonlyProvider)
+        actions: WriteGuard.isReadonly(ref)
             ? const []
             : [
                 TextButton(
@@ -194,7 +194,7 @@ class _PartnersScreenState extends ConsumerState<PartnersScreen> {
       mobileCards: partners.map(partnerCard).toList(),
       toolbar: Row(
         children: [
-          if (!ref.watch(isReadonlyProvider)) ...[
+          if (!WriteGuard.isReadonly(ref)) ...[
             ElevatedButton.icon(
               onPressed: onAdd,
               icon: const Icon(Icons.add, size: 16),
@@ -285,7 +285,7 @@ class _PartnersScreenState extends ConsumerState<PartnersScreen> {
                       )),
                       DataCell(Row(
                         mainAxisSize: MainAxisSize.min,
-                        children: ref.watch(isReadonlyProvider)
+                        children: WriteGuard.isReadonly(ref)
                             ? const []
                             : [
                                 TextButton(
diff --git a/client/lib/screens/products/products_screen.dart b/client/lib/screens/products/products_screen.dart
index 7a5dc3e..223cba1 100644
--- a/client/lib/screens/products/products_screen.dart
+++ b/client/lib/screens/products/products_screen.dart
@@ -10,7 +10,7 @@ import '../../widgets/data_table_card.dart';
 import '../../widgets/mobile_list_card.dart';
 import '../../widgets/page_scaffold.dart';
 import '../../core/utils/export_util.dart';
-import '../../core/auth/auth_state.dart';
+import '../../widgets/write_guard.dart';
 
 class ProductsScreen extends ConsumerStatefulWidget {
   const ProductsScreen({super.key});
@@ -355,10 +355,9 @@ class _ProductsScreenState extends ConsumerState<ProductsScreen> {
     required VoidCallback onAdd,
     required VoidCallback onExport,
   }) {
-    final readonly = ref.watch(isReadonlyProvider);
     return Row(
       children: [
-        if (!readonly) ...[
+        if (!WriteGuard.isReadonly(ref)) ...[
           ElevatedButton.icon(
             onPressed: onAdd,
             icon: const Icon(Icons.add, size: 16),
@@ -420,7 +419,7 @@ class _ProductsScreenState extends ConsumerState<ProductsScreen> {
           MobileCardField('单品数量', '$quantity'),
         if (remark?.isNotEmpty == true) MobileCardField('备注', remark),
       ],
-      actions: ref.watch(isReadonlyProvider)
+      actions: WriteGuard.isReadonly(ref)
           ? const []
           : [
               TextButton(
@@ -437,19 +436,20 @@ class _ProductsScreenState extends ConsumerState<ProductsScreen> {
   }
 
   Widget _actionButtons({required VoidCallback onEdit, required VoidCallback onDelete}) {
-    if (ref.watch(isReadonlyProvider)) return const SizedBox.shrink();
-    return Row(
-      mainAxisSize: MainAxisSize.min,
-      children: [
-        TextButton(
-          onPressed: onEdit,
-          child: const Text('编辑', style: TextStyle(fontSize: 12)),
-        ),
-        TextButton(
-          onPressed: onDelete,
-          child: const Text('删除', style: TextStyle(fontSize: 12, color: AppTheme.danger)),
-        ),
-      ],
+    return WriteGuard(
+      child: Row(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          TextButton(
+            onPressed: onEdit,
+            child: const Text('编辑', style: TextStyle(fontSize: 12)),
+          ),
+          TextButton(
+            onPressed: onDelete,
+            child: const Text('删除', style: TextStyle(fontSize: 12, color: AppTheme.danger)),
+          ),
+        ],
+      ),
     );
   }
 
diff --git a/client/lib/screens/settings/settings_screen.dart b/client/lib/screens/settings/settings_screen.dart
index bb95dd9..7968796 100644
--- a/client/lib/screens/settings/settings_screen.dart
+++ b/client/lib/screens/settings/settings_screen.dart
@@ -9,6 +9,7 @@ import 'package:shared_preferences/shared_preferences.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import '../../core/auth/auth_state.dart';
+import '../../widgets/write_guard.dart';
 import '../../core/config/app_config.dart';
 import '../../core/config/app_info.dart';
 import '../../core/responsive/responsive.dart';
@@ -218,12 +219,13 @@ class _SettingsScreenState extends ConsumerState<SettingsScreen> {
           padding: const EdgeInsets.symmetric(horizontal: 12),
           child: Row(
             children: [
-              if (!ref.watch(isReadonlyProvider))
-                ElevatedButton.icon(
+              WriteGuard(
+                child: ElevatedButton.icon(
                   onPressed: () => _showAddUserDialog(context),
                   icon: const Icon(Icons.person_add, size: 16),
                   label: const Text('新增用户'),
                 ),
+              ),
             ],
           ),
         ),
@@ -293,7 +295,7 @@ class _SettingsScreenState extends ConsumerState<SettingsScreen> {
                           )),
                           DataCell(Row(
                             mainAxisSize: MainAxisSize.min,
-                            children: ref.watch(isReadonlyProvider)
+                            children: WriteGuard.isReadonly(ref)
                                 ? const []
                                 : [
                               TextButton(
@@ -457,7 +459,7 @@ class _SettingsScreenState extends ConsumerState<SettingsScreen> {
                     style: const TextStyle(fontSize: 13),
                   ),
                 ),
-                if (!ref.watch(isReadonlyProvider)) ...[
+                if (!WriteGuard.isReadonly(ref)) ...[
                   const SizedBox(width: 8),
                   ElevatedButton(
                     onPressed: _isActivating ? null : _activateLicense,
@@ -619,13 +621,12 @@ class _SettingsScreenState extends ConsumerState<SettingsScreen> {
                               style: const TextStyle(
                                   fontFamily: 'monospace', fontSize: 12))),
                           DataCell(Text('${r.currentNo}')),
-                          DataCell(ref.watch(isReadonlyProvider)
-                              ? const SizedBox()
-                              : TextButton(
+                          DataCell(WriteGuard(
+                              child: TextButton(
                                   onPressed: () =>
                                       _showNumberRuleDialog(context, r),
                                   child: const Text('编辑',
-                                      style: TextStyle(fontSize: 12)))),
+                                      style: TextStyle(fontSize: 12))))),
                         ]))
                     .toList(),
               ),
@@ -804,7 +805,7 @@ class _SettingsScreenState extends ConsumerState<SettingsScreen> {
 
   // ── 数据导入 Tab ──────────────────────────────────────────
   Widget _buildImportTab() {
-    if (ref.watch(isReadonlyProvider)) {
+    if (WriteGuard.isReadonly(ref)) {
       return const Center(
         child: Text('只读账号无导入权限',
             style: TextStyle(color: AppTheme.textSecondary)),
diff --git a/client/lib/screens/shell/app_shell.dart b/client/lib/screens/shell/app_shell.dart
index db56d4e..2cd57e5 100644
--- a/client/lib/screens/shell/app_shell.dart
+++ b/client/lib/screens/shell/app_shell.dart
@@ -6,6 +6,7 @@ import 'package:intl/intl.dart';
 import 'dart:async';
 import 'package:flutter/foundation.dart' show kIsWeb;
 import '../../core/auth/auth_state.dart';
+import '../../widgets/write_guard.dart';
 import '../../core/config/app_config.dart';
 import '../../core/responsive/responsive.dart';
 import '../../core/theme/app_theme.dart';
@@ -210,7 +211,7 @@ class _AppShellState extends ConsumerState<AppShell> {
                 ),
                 const SizedBox(width: 4),
                 _ShopButton(user: user, version: appVersion),
-                if (ref.watch(isReadonlyProvider)) ...[
+                if (WriteGuard.isReadonly(ref)) ...[
                   const SizedBox(width: 8),
                   Container(
                     padding:
diff --git a/client/lib/screens/stock_in/stock_in_list_screen.dart b/client/lib/screens/stock_in/stock_in_list_screen.dart
index a008c6c..6c2830d 100644
--- a/client/lib/screens/stock_in/stock_in_list_screen.dart
+++ b/client/lib/screens/stock_in/stock_in_list_screen.dart
@@ -22,7 +22,7 @@ import '../../providers/product_provider.dart' show productRepositoryProvider;
 import '../../repositories/product_repository.dart';
 import '../../providers/finance_provider.dart' show financeRepositoryProvider;
 import '../../providers/shop_provider.dart' show shopInfoProvider;
-import '../../core/auth/auth_state.dart';
+import '../../widgets/write_guard.dart';
 
 class StockInListScreen extends ConsumerStatefulWidget {
   const StockInListScreen({super.key});
@@ -281,7 +281,7 @@ class _StockInListScreenState extends ConsumerState<StockInListScreen> {
           ref.read(stockInListProvider.notifier).setPageSize(s),
       toolbar: Row(
         children: [
-          if (showNewButton && !ref.watch(isReadonlyProvider))
+          if (showNewButton && !WriteGuard.isReadonly(ref))
             ElevatedButton.icon(
               onPressed: () => context.go('/stock-in/new'),
               icon: const Icon(Icons.add, size: 16),
@@ -345,7 +345,7 @@ class _StockInListScreenState extends ConsumerState<StockInListScreen> {
 
   /// 操作按钮列表，表格与移动端卡片共用。
   List<Widget> _orderActions(BuildContext context, StockInOrder o) {
-    final readonly = ref.watch(isReadonlyProvider);
+    final readonly = WriteGuard.isReadonly(ref);
     return [
       TextButton(
         onPressed: () => _showDetail(context, o.id),
diff --git a/client/lib/screens/stock_out/stock_out_list_screen.dart b/client/lib/screens/stock_out/stock_out_list_screen.dart
index b2d7089..8fbf3eb 100644
--- a/client/lib/screens/stock_out/stock_out_list_screen.dart
+++ b/client/lib/screens/stock_out/stock_out_list_screen.dart
@@ -20,7 +20,7 @@ import '../../providers/inventory_provider.dart';
 import '../../providers/tab_state_provider.dart';
 import '../../providers/product_provider.dart';
 import '../../providers/finance_provider.dart' show financeRepositoryProvider;
-import '../../core/auth/auth_state.dart';
+import '../../widgets/write_guard.dart';
 
 class StockOutListScreen extends ConsumerStatefulWidget {
   const StockOutListScreen({super.key});
@@ -287,7 +287,7 @@ class _StockOutListScreenState extends ConsumerState<StockOutListScreen> {
           ref.read(stockOutListProvider.notifier).setPageSize(s),
       toolbar: Row(
         children: [
-          if (showNewButton && !ref.watch(isReadonlyProvider))
+          if (showNewButton && !WriteGuard.isReadonly(ref))
             ElevatedButton.icon(
               onPressed: () => context.go('/stock-out/new'),
               icon: const Icon(Icons.add, size: 16),
@@ -351,7 +351,7 @@ class _StockOutListScreenState extends ConsumerState<StockOutListScreen> {
 
   /// 操作按钮列表，表格与移动端卡片共用。
   List<Widget> _orderActions(BuildContext context, StockOutOrder o) {
-    final readonly = ref.watch(isReadonlyProvider);
+    final readonly = WriteGuard.isReadonly(ref);
     return [
       TextButton(
         onPressed: () => _showDetail(context, o.id),