fix(client/test): pin zh locale 修 i18n 默认英文后失配的单测/组件测试

早前 i18n 把默认语种改英文(localeProvider 默认 AppLang.en),但这几个测试硬编码
const t = StringsZh() 中文预期,被测代码经 appTextProvider 渲染英文 → 断言失配
(既存 broken,先于 ds-flow;DinD 修复后 Flutter test job 才跑到暴露)。

修:各失败测试的 ProviderScope/Container overrides 加
localeProvider.overrideWith((ref) => _FixedLocale(AppLang.zh)),把被测代码钉回
中文(与硬编码 StringsZh 预期一致)。只动测试文件,未碰 lib/golden/test_config。

- connection_watchdog_test(节点异常提示 / 免费额度归零切断)
- node_connect_confirm_test(点节点/智能卡弹确认取消不切换)
- stats_page_test(PeriodCard 周期卡中文标签)

容器复跑 test/unit+widget+contract:+97 All passed。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/test/unit/connection_watchdog_test.dart

@@ -8,14 +8,23 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:pangolin_vpn/bridge/vpn_bridge.dart';
 import 'package:pangolin_vpn/bridge/vpn_bridge_provider.dart';
+import 'package:pangolin_vpn/l10n/app_text.dart';
 import 'package:pangolin_vpn/l10n/strings_zh.dart';
 import 'package:pangolin_vpn/models/node.dart';
 import 'package:pangolin_vpn/services/connect_api.dart';
 import 'package:pangolin_vpn/services/device_identity.dart';
+import 'package:pangolin_vpn/state/app_providers.dart';
 import 'package:pangolin_vpn/state/connection_provider.dart';
 import 'package:pangolin_vpn/state/nodes_provider.dart';
 import 'package:pangolin_vpn/state/quota_provider.dart';
 
+// localeProvider 现默认英文;测试硬编码 StringsZh 预期 → 钉死中文 locale。
+class _FixedLocale extends LocaleNotifier {
+  _FixedLocale(AppLang lang) {
+    state = lang;
+  }
+}
+
 // 可控假桥:能手动推 VpnStatus,无内部计时器(避免 pending timer)。
 class _FakeBridge implements VpnBridge {
   final _status = StreamController<VpnStatus>.broadcast();
@@ -94,6 +103,7 @@ void main() {
   ProviderContainer makeContainer(_FakeBridge bridge,
           {NodesNotifier Function()? nodes, DateTime Function()? now}) =>
       ProviderContainer(overrides: [
+        localeProvider.overrideWith((ref) => _FixedLocale(AppLang.zh)),
         vpnBridgeProvider.overrideWithValue(bridge),
         nodesProvider.overrideWith(nodes ?? _StubNodes.new),
         deviceIdentityProvider.overrideWithValue(DeviceIdentity(store: _MemKV())),

client/test/widget/node_connect_confirm_test.dart

@@ -8,10 +8,12 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:pangolin_vpn/bridge/vpn_bridge.dart';
 import 'package:pangolin_vpn/bridge/vpn_bridge_mock.dart';
 import 'package:pangolin_vpn/bridge/vpn_bridge_provider.dart';
+import 'package:pangolin_vpn/l10n/app_text.dart';
 import 'package:pangolin_vpn/l10n/strings_zh.dart';
 import 'package:pangolin_vpn/models/node.dart';
 import 'package:pangolin_vpn/pangolin_theme.dart';
 import 'package:pangolin_vpn/screens/nodes_page.dart';
+import 'package:pangolin_vpn/state/app_providers.dart';
 import 'package:pangolin_vpn/state/connection_provider.dart';
 import 'package:pangolin_vpn/state/nodes_provider.dart';
 import 'package:pangolin_vpn/widgets/smart_select_card.dart';
@@ -31,11 +33,19 @@ const _nodes = [
   Node(code: 'JP', nameZh: '东京', nameEn: 'Tokyo', ping: 35, uuid: 'jp-uuid', host: 'jp', port: 443),
 ];
 
+// localeProvider 现默认英文;测试硬编码 StringsZh 预期 → 钉死中文 locale。
+class _FixedLocale extends LocaleNotifier {
+  _FixedLocale(AppLang lang) {
+    state = lang;
+  }
+}
+
 void main() {
   setUpAll(disableGoogleFontsFetching);
   const t = StringsZh();
 
   ProviderContainer makeContainer(VpnBridge bridge) => ProviderContainer(overrides: [
+        localeProvider.overrideWith((ref) => _FixedLocale(AppLang.zh)),
         nodesProvider.overrideWith(_StubNodes.new),
         vpnBridgeProvider.overrideWithValue(bridge),
       ]);

client/test/widget/stats_page_test.dart

@@ -13,6 +13,7 @@ import 'package:http/http.dart' as http;
 import 'package:http/testing.dart';
 import 'package:pangolin_vpn/bridge/vpn_bridge_mock.dart';
 import 'package:pangolin_vpn/bridge/vpn_bridge_provider.dart';
+import 'package:pangolin_vpn/l10n/app_text.dart';
 import 'package:pangolin_vpn/l10n/strings_zh.dart';
 import 'package:pangolin_vpn/models/node.dart';
 import 'package:pangolin_vpn/pangolin_theme.dart';
@@ -20,6 +21,7 @@ import 'package:pangolin_vpn/screens/stats_page.dart';
 import 'package:pangolin_vpn/services/api_client.dart';
 import 'package:pangolin_vpn/services/token_store.dart';
 import 'package:pangolin_vpn/state/account_providers.dart';
+import 'package:pangolin_vpn/state/app_providers.dart';
 import 'package:pangolin_vpn/state/auth_provider.dart';
 import 'package:pangolin_vpn/state/nodes_provider.dart';
 import 'package:pangolin_vpn/widgets/period_card.dart';
@@ -101,6 +103,13 @@ Finder _metric(String period, int i, String value, String unit) => find.byWidget
           w.metrics[i].unit == unit,
     );
 
+// localeProvider 现默认英文;测试硬编码 StringsZh 预期 → 钉死中文 locale。
+class _FixedLocale extends LocaleNotifier {
+  _FixedLocale(AppLang lang) {
+    state = lang;
+  }
+}
+
 void main() {
   setUpAll(disableGoogleFontsFetching);
   const t = StringsZh();
@@ -111,6 +120,7 @@ void main() {
 
     await tester.pumpWidget(ProviderScope(
       overrides: [
+        localeProvider.overrideWith((ref) => _FixedLocale(AppLang.zh)),
         tokenStoreProvider.overrideWithValue(const _LoggedInTokenStore()),
         apiClientProvider.overrideWithValue(ApiClient(
           baseUrl: 'http://test.local',