design+client: 抽 .view-body/PageBody 统一桌面内容页宽度(600/wide 840)——stats·contact 补约束,settings·contact 560→600,九页收口

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01P9G7E3wmAYL9KeYCVZVsqu

client/lib/screens/notifications_page.dart

@@ -7,6 +7,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 import '../l10n/app_text.dart';
 import '../pangolin_theme.dart';
+import '../widgets/page_body.dart';
 import '../widgets/pangolin_icons.dart';
 import '../widgets/status_pill.dart';
 
@@ -136,7 +137,7 @@ class NotificationsScreen extends ConsumerWidget {
           ],
         );
 
-    if (embedded) return content();
+    if (embedded) return PageBody(child: content());
     return Scaffold(
       backgroundColor: c.bg,
       body: SafeArea(
@@ -151,7 +152,7 @@ class NotificationsScreen extends ConsumerWidget {
               Text(t.notifTitle, style: PangolinText.h3.copyWith(color: c.fg1, fontWeight: FontWeight.w700)),
             ]),
           ),
-          Expanded(child: content()),
+          Expanded(child: PageBody(child: content())),
         ]),
       ),
     );