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/repositories/finance_repository.dart

@@ -11,6 +11,9 @@ class FinanceRepository {
   Future<PageResult<FinanceRecord>> listRecords({
     String? type,
     String? month,
+    String? startDate,
+    String? endDate,
+    int? partnerId,
     int page = 1,
     int pageSize = 50,
   }) async {
@@ -20,6 +23,9 @@ class FinanceRepository {
         'page_size': pageSize,
         if (type != null && type.isNotEmpty) 'type': type,
         if (month != null && month.isNotEmpty) 'month': month,
+        if (startDate != null && startDate.isNotEmpty) 'start_date': startDate,
+        if (endDate != null && endDate.isNotEmpty) 'end_date': endDate,
+        if (partnerId != null) 'partner_id': partnerId,
       };
       final resp = await _client.get('/finance/records', params: params);
       return PageResult.fromJson(
@@ -34,6 +40,41 @@ class FinanceRepository {
     }
   }
 
+  /// 按往来单位汇总未结清应收/应付（GET /finance/summary）
+  Future<List<PartnerFinanceSummary>> partnerSummary() async {
+    try {
+      final resp = await _client.get('/finance/summary');
+      final data = (resp.data as Map<String, dynamic>)['data'];
+      return [
+        for (final row in (data as List? ?? const []))
+          PartnerFinanceSummary.fromJson(row as Map<String, dynamic>),
+      ];
+    } on DioException catch (e) {
+      throw AppException(
+        e.response?.data?['error'] as String? ?? '获取往来汇总失败',
+        statusCode: e.response?.statusCode,
+      );
+    }
+  }
+
+  /// 近 N 个自然月收支趋势（GET /finance/trend）：in=当月销售额、out=当月采购额。
+  Future<List<TrendPoint>> trend({int months = 6}) async {
+    try {
+      final resp =
+          await _client.get('/finance/trend', params: {'months': months});
+      final data = (resp.data as Map<String, dynamic>)['data'];
+      return [
+        for (final row in (data as List? ?? const []))
+          TrendPoint.fromJson(row as Map<String, dynamic>),
+      ];
+    } on DioException catch (e) {
+      throw AppException(
+        e.response?.data?['error'] as String? ?? '获取收支趋势失败',
+        statusCode: e.response?.statusCode,
+      );
+    }
+  }
+
   Future<void> create(Map<String, dynamic> body) async {
     try {
       await _client.post('/finance/records', data: body);
@@ -58,8 +99,8 @@ class FinanceRepository {
 
   Future<void> closeByRef(String refType, int refId) async {
     try {
-      await _client.put(
-          '/finance/records/close-by-ref?ref_type=$refType&ref_id=$refId');
+      await _client
+          .put('/finance/records/close-by-ref?ref_type=$refType&ref_id=$refId');
     } on DioException catch (e) {
       throw AppException(
         e.response?.data?['error'] as String? ?? '结清失败',