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/lib/providers/product_option_provider.dart

@@ -5,7 +5,8 @@ import '../models/product_option.dart';
 import '../providers/connectivity_provider.dart';
 import '../repositories/product_option_repository.dart';
 
-final productOptionRepositoryProvider = Provider<ProductOptionRepository>((ref) {
+final productOptionRepositoryProvider =
+    Provider<ProductOptionRepository>((ref) {
   return ProductOptionRepository(ref.watch(apiClientProvider));
 });
 
@@ -55,7 +56,8 @@ final productSeriesListProvider =
   ProductSeriesListNotifier.new,
 );
 
-class ProductSeriesListNotifier extends AsyncNotifier<List<ProductSeriesOption>> {
+class ProductSeriesListNotifier
+    extends AsyncNotifier<List<ProductSeriesOption>> {
   @override
   Future<List<ProductSeriesOption>> build() async {
     ref.watch(authStateProvider.select((s) => s.user?.shopId));
@@ -133,7 +135,8 @@ final productOriginListProvider =
   ProductOriginListNotifier.new,
 );
 
-class ProductOriginListNotifier extends AsyncNotifier<List<ProductOriginOption>> {
+class ProductOriginListNotifier
+    extends AsyncNotifier<List<ProductOriginOption>> {
   @override
   Future<List<ProductOriginOption>> build() async {
     ref.watch(authStateProvider.select((s) => s.user?.shopId));
@@ -167,12 +170,13 @@ class ProductOriginListNotifier extends AsyncNotifier<List<ProductOriginOption>>
 
 // ── 保质期 ────────────────────────────────────────────────────
 
-final productShelfLifeListProvider =
-    AsyncNotifierProvider<ProductShelfLifeListNotifier, List<ProductShelfLifeOption>>(
+final productShelfLifeListProvider = AsyncNotifierProvider<
+    ProductShelfLifeListNotifier, List<ProductShelfLifeOption>>(
   ProductShelfLifeListNotifier.new,
 );
 
-class ProductShelfLifeListNotifier extends AsyncNotifier<List<ProductShelfLifeOption>> {
+class ProductShelfLifeListNotifier
+    extends AsyncNotifier<List<ProductShelfLifeOption>> {
   @override
   Future<List<ProductShelfLifeOption>> build() async {
     ref.watch(authStateProvider.select((s) => s.user?.shopId));
@@ -206,12 +210,13 @@ class ProductShelfLifeListNotifier extends AsyncNotifier<List<ProductShelfLifeOp
 
 // ── 储存方式 ──────────────────────────────────────────────────
 
-final productStorageListProvider =
-    AsyncNotifierProvider<ProductStorageListNotifier, List<ProductStorageOption>>(
+final productStorageListProvider = AsyncNotifierProvider<
+    ProductStorageListNotifier, List<ProductStorageOption>>(
   ProductStorageListNotifier.new,
 );
 
-class ProductStorageListNotifier extends AsyncNotifier<List<ProductStorageOption>> {
+class ProductStorageListNotifier
+    extends AsyncNotifier<List<ProductStorageOption>> {
   @override
   Future<List<ProductStorageOption>> build() async {
     ref.watch(authStateProvider.select((s) => s.user?.shopId));
@@ -245,12 +250,13 @@ class ProductStorageListNotifier extends AsyncNotifier<List<ProductStorageOption
 
 // ── 描述文档 ──────────────────────────────────────────────────
 
-final productDescriptionDocListProvider =
-    AsyncNotifierProvider<ProductDescriptionDocListNotifier, List<ProductDescriptionDoc>>(
+final productDescriptionDocListProvider = AsyncNotifierProvider<
+    ProductDescriptionDocListNotifier, List<ProductDescriptionDoc>>(
   ProductDescriptionDocListNotifier.new,
 );
 
-class ProductDescriptionDocListNotifier extends AsyncNotifier<List<ProductDescriptionDoc>> {
+class ProductDescriptionDocListNotifier
+    extends AsyncNotifier<List<ProductDescriptionDoc>> {
   @override
   Future<List<ProductDescriptionDoc>> build() async {
     ref.watch(authStateProvider.select((s) => s.user?.shopId));
@@ -272,7 +278,9 @@ class ProductDescriptionDocListNotifier extends AsyncNotifier<List<ProductDescri
   }
 
   Future<void> updateItem(int id, Map<String, dynamic> data) async {
-    await ref.read(productOptionRepositoryProvider).updateDescriptionDoc(id, data);
+    await ref
+        .read(productOptionRepositoryProvider)
+        .updateDescriptionDoc(id, data);
     reload();
   }