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/golden/product_detail_golden_test.dart

@@ -21,9 +21,15 @@ import '../support/golden_harness.dart';
 class _FakeProductRepo implements ProductRepository {
   @override
   Future<Product> getDetail(int id) async => const Product(
-        id: 1, code: 'MT-FT-500', name: '茅台 飞天 53°', unit: '件',
-        series: '飞天', spec: '500ml×6', brand: '茅台',
-        purchasePrice: 2680, categoryName: '酱香');
+      id: 1,
+      code: 'MT-FT-500',
+      name: '茅台 飞天 53°',
+      unit: '件',
+      series: '飞天',
+      spec: '500ml×6',
+      brand: '茅台',
+      purchasePrice: 2680,
+      categoryName: '酱香');
   @override
   Future<List<({String date, double price})>> getPriceHistory(int id) async =>
       const [
@@ -33,8 +39,7 @@ class _FakeProductRepo implements ProductRepository {
         (date: '2025-11-15', price: 2580),
       ];
   @override
-  dynamic noSuchMethod(Invocation invocation) =>
-      super.noSuchMethod(invocation);
+  dynamic noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }
 
 class _FakeInvRepo implements InventoryRepository {
@@ -43,6 +48,7 @@ class _FakeInvRepo implements InventoryRepository {
     int? warehouseId,
     int? productId,
     String? keyword,
+    String? code,
     List<String>? series,
     List<String>? spec,
     int page = 1,
@@ -63,22 +69,33 @@ class _FakeInvRepo implements InventoryRepository {
   }) async =>
       const PageResult(data: [
         InventoryLog(
-            warehouseId: 1, productId: 1, direction: 'in', quantity: 24,
+            warehouseId: 1,
+            productId: 1,
+            direction: 'in',
+            quantity: 24,
             createdAt: '2026-06-20T09:00:00'),
         InventoryLog(
-            warehouseId: 1, productId: 1, direction: 'out', quantity: 12,
+            warehouseId: 1,
+            productId: 1,
+            direction: 'out',
+            quantity: 12,
             createdAt: '2026-06-18T09:00:00'),
         InventoryLog(
-            warehouseId: 2, productId: 1, direction: 'out', quantity: 18,
+            warehouseId: 2,
+            productId: 1,
+            direction: 'out',
+            quantity: 18,
             createdAt: '2026-06-15T09:00:00'),
         InventoryLog(
-            warehouseId: 1, productId: 1, direction: 'in', quantity: 36,
+            warehouseId: 1,
+            productId: 1,
+            direction: 'in',
+            quantity: 36,
             createdAt: '2026-06-12T09:00:00'),
       ], total: 4, page: 1, pageSize: 100);
 
   @override
-  dynamic noSuchMethod(Invocation invocation) =>
-      super.noSuchMethod(invocation);
+  dynamic noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }
 
 List<Override> _overrides() => [