feat(client): 财务应收应付汇总增加往来单位搜索（两端，原型同步）

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

client/test/finance_summary_search_test.dart

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+// test/finance_summary_search_test.dart — 财务「应收/应付 汇总」往来单位搜索回归。
+//
+// financePartnerRowsProvider（GET /finance/summary）不分页、一次性全量加载，
+// 搜索口径=显示口径：仅需验证本地 contains 过滤在已加载行上生效——桌面
+// _summaryTable 工具头 DsSearchBox / 移动 应收·应付 分段头 MSearchRow 均覆盖：
+// 1. 输入关键字 → 汇总行按往来单位名过滤，未命中不显示；
+// 2. 关键字不匹配任何行 → 展示「没有匹配的往来单位」空态；
+// 3. 清空关键字 → 恢复全量展示。
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+import 'package:jiu_client/core/api/api_client.dart';
+import 'package:jiu_client/core/auth/auth_state.dart';
+import 'package:jiu_client/core/models/page_result.dart';
+import 'package:jiu_client/core/theme/themes.dart';
+import 'package:jiu_client/models/finance.dart';
+import 'package:jiu_client/models/partner.dart';
+import 'package:jiu_client/models/stock_summary.dart';
+import 'package:jiu_client/providers/finance_provider.dart';
+import 'package:jiu_client/providers/partner_provider.dart';
+import 'package:jiu_client/providers/stock_in_provider.dart';
+import 'package:jiu_client/providers/stock_out_provider.dart';
+import 'package:jiu_client/repositories/finance_repository.dart';
+import 'package:jiu_client/screens/finance/finance_screen.dart';
+import 'package:jiu_client/widgets/ds/ds_atoms.dart' show DsSearchBox;
+import 'package:jiu_client/widgets/ds/m_search_row.dart' show MSearchRow;
+
+/// 不打真实网络：仅用于满足 FinanceRepository 构造签名，方法全部被覆写。
+class _DummyApiClient extends ApiClient {
+  _DummyApiClient() : super(token: 'test-token');
+}
+
+/// 固定 3 条往来单位汇总（2 应收 + 1 应付），流水列表恒空（本测试不关心流水）。
+class _FakeFinanceRepository extends FinanceRepository {
+  _FakeFinanceRepository() : super(_DummyApiClient());
+
+  @override
+  Future<PageResult<FinanceRecord>> listRecords({
+    String? type,
+    String? month,
+    String? startDate,
+    String? endDate,
+    int? partnerId,
+    int page = 1,
+    int pageSize = 50,
+  }) async =>
+      const PageResult(data: [], total: 0, page: 1, pageSize: 50);
+
+  @override
+  Future<List<PartnerFinanceSummary>> partnerSummary() async => const [
+        PartnerFinanceSummary(
+            partnerId: 1,
+            partnerName: '华东酒类批发',
+            type: 'receivable',
+            recordCount: 2,
+            totalAmount: 128400),
+        PartnerFinanceSummary(
+            partnerId: 2,
+            partnerName: '金樽商贸',
+            type: 'receivable',
+            recordCount: 1,
+            totalAmount: 86200),
+        PartnerFinanceSummary(
+            partnerId: 3,
+            partnerName: '茅台华南经销',
+            type: 'payable',
+            recordCount: 1,
+            totalAmount: 142800),
+      ];
+
+  @override
+  Future<List<TrendPoint>> trend({int months = 6}) async => const [];
+}
+
+class _FakeAllPartners extends PartnerListNotifier {
+  @override
+  Future<PageResult<Partner>> build() async => const PageResult(
+        data: [
+          Partner(id: 1, name: '华东酒类批发', type: 'customer'),
+          Partner(id: 2, name: '金樽商贸', type: 'customer'),
+          Partner(id: 3, name: '茅台华南经销', type: 'supplier'),
+        ],
+        total: 3,
+        page: 1,
+        pageSize: 1000,
+      );
+}
+
+List<Override> _overrides() => [
+      financeRepositoryProvider.overrideWith((ref) => _FakeFinanceRepository()),
+      allPartnersProvider.overrideWith(() => _FakeAllPartners()),
+      stockOutSummaryProvider.overrideWith(
+          (ref) async => const StockSummary(monthAmount: 0, lastMonthAmount: 0)),
+      stockInSummaryProvider.overrideWith(
+          (ref) async => const StockSummary(monthAmount: 0, lastMonthAmount: 0)),
+      isReadonlyProvider.overrideWithValue(false),
+    ];
+
+Future<void> _pumpFinance(
+  WidgetTester tester, {
+  required Size size,
+}) async {
+  tester.view.physicalSize = size;
+  tester.view.devicePixelRatio = 1.0;
+  addTearDown(tester.view.resetPhysicalSize);
+  addTearDown(tester.view.resetDevicePixelRatio);
+
+  await tester.pumpWidget(ProviderScope(
+    overrides: _overrides(),
+    child: MaterialApp(
+      debugShowCheckedModeBanner: false,
+      theme: buildTheme('a'),
+      home: const Scaffold(body: FinanceScreen()),
+    ),
+  ));
+  await tester.pumpAndSettle();
+}
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+  SharedPreferences.setMockInitialValues({});
+
+  group('桌面汇总卡往来单位搜索', () {
+    testWidgets('输入关键字过滤汇总行，无匹配报空态，清空恢复全量', (tester) async {
+      await _pumpFinance(tester, size: const Size(1280, 900));
+
+      // 初始：3 条汇总行全部展示。
+      expect(find.text('华东酒类批发'), findsOneWidget);
+      expect(find.text('金樽商贸'), findsOneWidget);
+      expect(find.text('茅台华南经销'), findsOneWidget);
+
+      final searchField = find.descendant(
+        of: find.byType(DsSearchBox),
+        matching: find.byType(TextField),
+      );
+      expect(searchField, findsOneWidget);
+
+      // 输入「金樽」：只剩「金樽商贸」。
+      await tester.enterText(searchField, '金樽');
+      await tester.pumpAndSettle();
+      expect(find.text('金樽商贸'), findsOneWidget);
+      expect(find.text('华东酒类批发'), findsNothing);
+      expect(find.text('茅台华南经销'), findsNothing);
+
+      // 输入不存在的关键字：空态提示。
+      await tester.enterText(searchField, '不存在的单位名');
+      await tester.pumpAndSettle();
+      expect(find.text('没有匹配的往来单位'), findsOneWidget);
+      expect(find.text('金樽商贸'), findsNothing);
+
+      // 清空：恢复全量 3 行。
+      await tester.enterText(searchField, '');
+      await tester.pumpAndSettle();
+      expect(find.text('华东酒类批发'), findsOneWidget);
+      expect(find.text('金樽商贸'), findsOneWidget);
+      expect(find.text('茅台华南经销'), findsOneWidget);
+    });
+  });
+
+  group('移动应收/应付分段往来单位搜索', () {
+    testWidgets('应收分段输入关键字过滤卡片，清空恢复全量', (tester) async {
+      await _pumpFinance(tester, size: const Size(390, 1600));
+
+      // 默认「应收」分段：仅展示 recv>0 的两条（华东/金樽），不含应付的茅台。
+      expect(find.text('华东酒类批发'), findsOneWidget);
+      expect(find.text('金樽商贸'), findsOneWidget);
+      expect(find.text('茅台华南经销'), findsNothing);
+
+      final searchField = find.descendant(
+        of: find.byType(MSearchRow),
+        matching: find.byType(TextField),
+      );
+      expect(searchField, findsOneWidget);
+
+      await tester.enterText(searchField, '金樽');
+      await tester.pumpAndSettle();
+      expect(find.text('金樽商贸'), findsOneWidget);
+      expect(find.text('华东酒类批发'), findsNothing);
+
+      // 无匹配 → 分段空态。
+      await tester.enterText(searchField, '不存在的单位名');
+      await tester.pumpAndSettle();
+      expect(find.text('没有匹配的往来单位'), findsOneWidget);
+
+      // 清空恢复。
+      await tester.enterText(searchField, '');
+      await tester.pumpAndSettle();
+      expect(find.text('华东酒类批发'), findsOneWidget);
+      expect(find.text('金樽商贸'), findsOneWidget);
+    });
+  });
+}