feat(flutter): 增加关键操作震动反馈

test/auth/auth_page_test.dart

@@ -11,10 +11,12 @@ import 'package:fruitshorts/core/data/remote/auth_api.dart';
 import 'package:fruitshorts/core/data/remote/api_client.dart';
 import 'package:fruitshorts/core/data/services/auth_controller.dart';
 import 'package:fruitshorts/core/data/services/auth_session_store.dart';
+import 'package:fruitshorts/core/platform/haptics.dart';
 import 'package:fruitshorts/l10n/app_localizations.dart';
 import 'package:fruitshorts/pages/auth/auth_view.dart';
 
 import '../support/fake_http_adapter.dart';
+import '../support/fake_haptics.dart';
 
 /// 登录/注册页的可读证据：校验提示 + 登录/注册切换 + 未登录时不会去发请求。
 void main() {
@@ -27,6 +29,7 @@ void main() {
     WidgetTester tester, {
     bool signUp = false,
     AuthApi? api,
+    FakeHaptics? haptics,
   }) async {
     final auth = AuthController(
       api ??
@@ -42,8 +45,11 @@ void main() {
       AuthSessionStore(),
     );
     await tester.pumpWidget(
-      ChangeNotifierProvider<AuthController>.value(
-        value: auth,
+      MultiProvider(
+        providers: [
+          ChangeNotifierProvider<AuthController>.value(value: auth),
+          Provider<Haptics>.value(value: haptics ?? FakeHaptics()),
+        ],
         child: MaterialApp(
           locale: const Locale('en'),
           localizationsDelegates: AppLocalizations.localizationsDelegates,
@@ -168,7 +174,8 @@ void main() {
     tester,
   ) async {
     final api = _PendingAuthApi();
-    await pumpAuthPage(tester, api: api);
+    final haptics = FakeHaptics();
+    await pumpAuthPage(tester, api: api, haptics: haptics);
     await tester.enterText(find.byKey(const Key('auth-email')), 'a@b.com');
     await tester.enterText(find.byKey(const Key('auth-password')), 'abcd1234');
     await tester.tap(find.byKey(const Key('auth-password')));
@@ -176,6 +183,7 @@ void main() {
     await tester.pump();
 
     expect(api.loginCalls, 1);
+    expect(haptics.lightImpacts, 1);
     expect(
       tester.widget<TextField>(find.byKey(const Key('auth-email'))).enabled,
       isFalse,