feat(client): 登录/注册页照原型重建，ds 真相源组件族统一全部屏

- 登录/注册（login.html/register.html 1:1）：两栏卡片+品牌渐变面板+主题小衣服
  pill（onSurface 变体）+记住我（记录并预填最近账号）+原型式 toast 校验；
  登录 fidelity 1.4–2.1% 三主题全绿；注册暂不入闸（少 门店编号/兑换券 字段，
  已记 CONTRACT，screens.mjs 留存根）
- ds 原子补齐：DsToast（.toast 单例）/DsCheck（.check/.agree）/DsButton lg 档/
  DsSelect 替换全部旧 DropdownButton/DsField label 在上/DsInput 后缀与密码形态
- 全屏统一：对话框按钮全 DsButton、盒式输入主题钉死（visualDensity.standard、
  h38、InputDecorationTheme 渗漏修复）、图标全 lucide、JetBrains Mono 三端同源、
  BrandMark 真相源 logo、只读模式写操作全量守卫（WriteGuard+DsToast）
- 出入库列表：版式对齐原型（卡片对齐+搜索框居中）、KPI 近30天滚动、结清后
  失效财务应收应付表；商品编辑抽屉介绍库改搜索下拉、图片双击全屏预览
- 删除旧 UI 死代码：DataTableCard/FormDialog/PageScaffold/SearchChip/
  SelectProductDialog/tabStateProvider
- golden/fidelity：stock-in/out 补注册（9%）、login 入册（8%）、goldens 全量重打；
  修复 pubspec flutter_web_plugins 非法声明（CI pub get 阻断）

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JJ1g8XV1YhhmHRzhwWEW7o

client/test/write_guard_test.dart

@@ -4,7 +4,6 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:jiu_client/core/auth/auth_state.dart';
 import 'package:jiu_client/core/config/license_copy.dart';
 import 'package:jiu_client/core/theme/themes.dart';
-import 'package:jiu_client/models/license.dart';
 import 'package:jiu_client/providers/license_provider.dart';
 import 'package:jiu_client/widgets/write_guard.dart';
 
@@ -55,7 +54,8 @@ void main() {
   testWidgets('只读角色：按钮隐藏（findsNothing）', (tester) async {
     var tapped = false;
     await tester.pumpWidget(
-      _harness(readonly: true, lic: _lic('normal'), onPressed: () => tapped = true),
+      _harness(
+          readonly: true, lic: _lic('normal'), onPressed: () => tapped = true),
     );
     await tester.pumpAndSettle();
 
@@ -66,7 +66,8 @@ void main() {
   testWidgets('operator + normal：按钮可见且可点', (tester) async {
     var tapped = false;
     await tester.pumpWidget(
-      _harness(readonly: false, lic: _lic('normal'), onPressed: () => tapped = true),
+      _harness(
+          readonly: false, lic: _lic('normal'), onPressed: () => tapped = true),
     );
     await tester.pumpAndSettle();
 
@@ -114,6 +115,8 @@ void main() {
 
     expect(tapped, isFalse);
     expect(find.text(LicenseCopy.writeBlockedToast(lic)), findsOneWidget);
+    // DsToast 2.2s 自动消失计时器：走完再收尾，避免 pending timer 断言
+    await tester.pump(const Duration(milliseconds: 2300));
   });
 
   testWidgets('operator + locked（过期>15天）：按钮可见但禁用，弹锁定提示', (tester) async {
@@ -130,5 +133,7 @@ void main() {
 
     expect(tapped, isFalse);
     expect(find.text(LicenseCopy.writeBlockedToast(lic)), findsOneWidget);
+    // DsToast 2.2s 自动消失计时器：走完再收尾，避免 pending timer 断言
+    await tester.pump(const Duration(milliseconds: 2300));
   });
 }