feat(client): 往来单位屏设计语言重建（副标/状态徽章/两行名称/响应式 toolbar）

- 副标「共 N 个供应商/客户」(还原 .head .sub)
- 状态 → StatusPill（启用绿/停用灰，新 _PartnerStatusPill），桌面+移动一致
- 编码+名称合并两行（name 加粗 + code 等宽 muted）
- toolbar 响应式（窄屏搜索独占一行 + 操作行）+ token 间距，修预存窄屏溢出
- 整屏 golden ×三主题（桌面+移动）入回归闸
暂缓（数据缺口/有意偏差）：应收/应付列（Partner 模型无该字段）、
类型 chips（现保留 供应商/客户 两 Tab）。

analyze 0 error · flutter test +181（往来桌面/移动各 3 golden）。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TSKEiHsvauyxYUW2itzUXX

client/test/golden/partners_golden_test.dart

@@ -0,0 +1,96 @@
+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/models/page_result.dart';
+import 'package:jiu_client/core/auth/auth_state.dart';
+import 'package:jiu_client/models/partner.dart';
+import 'package:jiu_client/providers/partner_provider.dart';
+import 'package:jiu_client/screens/partners/partners_screen.dart';
+
+import '../support/golden_harness.dart';
+
+/// design-distill 阶段4：往来单位整屏 golden × 三主题（桌面 + 移动，回归闸）。
+/// 保真目检：shoot partners.html + montage 与 goldens/partners_*.png 并排。
+/// 更新基准：flutter test --update-goldens test/golden/partners_golden_test.dart
+
+const _suppliers = [
+  Partner(
+      id: 1, code: 'GYS-001', name: '茅台华东总代', type: 'supplier',
+      contact: '张伟', phone: '138-0011-2233', address: '上海市黄浦区中山东路 8 号',
+      status: 'enabled'),
+  Partner(
+      id: 2, code: 'GYS-002', name: '老窖酒水批发', type: 'supplier',
+      contact: '李建国', phone: '139-2200-7788', address: '江苏省南京市建邺区江东中路',
+      status: 'enabled'),
+  Partner(
+      id: 3, code: 'GYS-003', name: '五粮液川南运营中心', type: 'supplier',
+      contact: '刘海涛', phone: '135-8899-0011', address: '四川省宜宾市翠屏区岷江路',
+      status: 'disabled'),
+];
+
+const _customers = [
+  Partner(
+      id: 11, code: 'KH-001', name: '鼎丰超市', type: 'customer',
+      contact: '王芳', phone: '137-6655-4321', address: '浙江省杭州市西湖区文三路',
+      status: 'enabled'),
+  Partner(
+      id: 12, code: 'KH-002', name: '金樽酒楼', type: 'customer',
+      contact: '陈静', phone: '136-2211-9900', address: '江苏省苏州市姑苏区干将路',
+      status: 'enabled'),
+];
+
+class _FakeSupplierNotifier extends PartnerListNotifier {
+  @override
+  Future<PageResult<Partner>> build() async => const PageResult(
+      data: _suppliers, total: 3, page: 1, pageSize: 20);
+  @override
+  void setPage(int page) {}
+  @override
+  void setPageSize(int pageSize) {}
+  @override
+  void setKeyword(String keyword) {}
+  @override
+  void reload() {}
+}
+
+class _FakeCustomerNotifier extends PartnerListNotifier {
+  @override
+  Future<PageResult<Partner>> build() async => const PageResult(
+      data: _customers, total: 2, page: 1, pageSize: 20);
+  @override
+  void setPage(int page) {}
+  @override
+  void setPageSize(int pageSize) {}
+  @override
+  void setKeyword(String keyword) {}
+  @override
+  void reload() {}
+}
+
+List<Override> _overrides() => [
+      supplierListProvider.overrideWith(() => _FakeSupplierNotifier()),
+      customerListProvider.overrideWith(() => _FakeCustomerNotifier()),
+      isReadonlyProvider.overrideWithValue(false),
+    ];
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+  SharedPreferences.setMockInitialValues({});
+
+  goldenAcrossThemes(
+    'partners 整屏(桌面)',
+    goldenPrefix: 'partners',
+    child: () => const Scaffold(body: PartnersScreen()),
+    overrides: _overrides,
+    logical: const Size(1280, 900),
+  );
+
+  goldenAcrossThemes(
+    'partners 整屏(移动)',
+    goldenPrefix: 'partners_mobile',
+    child: () => const Scaffold(body: PartnersScreen()),
+    overrides: _overrides,
+    logical: const Size(390, 1200),
+  );
+}