feat(client): 设备管理屏在线状态徽章 → StatusPill + golden

onlineBadge（在线/离线 圆点文字）→ StatusPill（圆点软底 pill，
success/okSoft 与 muted/infoSoft）；整屏 golden ×三主题（桌面+移动）入回归闸。

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

client/lib/screens/devices/device_management_screen.dart

@@ -7,6 +7,7 @@ import '../../core/theme/context_tokens.dart';
 import '../../models/session.dart';
 import '../../providers/session_provider.dart';
 import '../../widgets/data_table_card.dart';
+import '../../widgets/kpi_card.dart';
 import '../../widgets/mobile_list_card.dart';
 
 /// 设备 / 状态管理：本店在线设备/会话列表。
@@ -81,20 +82,16 @@ class DeviceManagementScreen extends ConsumerWidget {
 
   Widget _buildTable(BuildContext context, WidgetRef ref,
       List<DeviceSession> sessions, bool canKick) {
-    Widget onlineBadge(bool online) => Row(
-          mainAxisSize: MainAxisSize.min,
-          children: [
-            Icon(Icons.circle,
-                size: 9,
-                color: online ? context.tokens.success : context.tokens.muted),
-            const SizedBox(width: 4),
-            Text(online ? '在线' : '离线',
-                style: TextStyle(
-                    fontSize: 13,
-                    color:
-                        online ? context.tokens.success : context.tokens.muted)),
-          ],
-        );
+    // 还原原型 .badge.b-在线/b-离线：圆点软底 pill。
+    Widget onlineBadge(bool online) => online
+        ? StatusPill(
+            label: '在线',
+            color: context.tokens.success,
+            background: context.tokens.okSoft)
+        : StatusPill(
+            label: '离线',
+            color: context.tokens.muted,
+            background: context.tokens.infoSoft);
 
     String fmt(DateTime? t) => t == null ? '-' : _fmt.format(t);
 

client/test/golden/device_management_golden_test.dart

@@ -0,0 +1,63 @@
+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/models/session.dart';
+import 'package:jiu_client/providers/session_provider.dart';
+import 'package:jiu_client/screens/devices/device_management_screen.dart';
+
+import '../support/golden_harness.dart';
+
+/// design-distill 阶段4：设备管理整屏 golden × 三主题（桌面 + 移动）。
+/// 验证在线/离线状态 → StatusPill 随主题换色。
+/// 更新基准：flutter test --update-goldens test/golden/device_management_golden_test.dart
+
+List<DeviceSession> _sessions() => [
+      DeviceSession(
+          id: 1, userId: 1, username: '王经理', realName: '王经理',
+          platform: 'macos', platformClass: 'desktop', deviceName: 'MacBook Pro',
+          ip: '192.168.1.12', createdAt: DateTime(2026, 6, 20, 9, 12),
+          lastSeenAt: DateTime(2026, 6, 25, 12, 50), online: true, isCurrent: true),
+      DeviceSession(
+          id: 2, userId: 2, username: '李销售', realName: '李销售',
+          platform: 'android', platformClass: 'mobile', deviceName: 'Xiaomi 14',
+          ip: '192.168.1.23', createdAt: DateTime(2026, 6, 24, 14, 30),
+          lastSeenAt: DateTime(2026, 6, 25, 11, 05), online: true, isCurrent: false),
+      DeviceSession(
+          id: 3, userId: 3, username: '张前台', realName: '张前台',
+          platform: 'windows', platformClass: 'desktop', deviceName: 'ThinkPad',
+          ip: '192.168.1.31', createdAt: DateTime(2026, 6, 22, 8, 40),
+          lastSeenAt: DateTime(2026, 6, 23, 18, 20), online: false, isCurrent: false),
+    ];
+
+class _FakeSessionNotifier extends SessionListNotifier {
+  @override
+  Future<List<DeviceSession>> build() async => _sessions();
+  @override
+  Future<void> reload() async {}
+}
+
+List<Override> _overrides() => [
+      sessionListProvider.overrideWith(() => _FakeSessionNotifier()),
+    ];
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+  SharedPreferences.setMockInitialValues({});
+
+  goldenAcrossThemes(
+    'device management 整屏(桌面)',
+    goldenPrefix: 'device_management',
+    child: () => const Scaffold(body: DeviceManagementScreen()),
+    overrides: _overrides,
+    logical: const Size(1280, 900),
+  );
+
+  goldenAcrossThemes(
+    'device management 整屏(移动)',
+    goldenPrefix: 'device_management_mobile',
+    child: () => const Scaffold(body: DeviceManagementScreen()),
+    overrides: _overrides,
+    logical: const Size(390, 1100),
+  );
+}