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/contact_page.dart

@@ -10,6 +10,7 @@ import '../pangolin_theme.dart';
 import '../services/channel_launch.dart';
 import '../services/contact_channels.dart';
 import '../state/app_providers.dart';
+import '../widgets/page_body.dart';
 import '../widgets/pangolin_icons.dart';
 
 class ContactPage extends ConsumerWidget {
@@ -36,8 +37,7 @@ class ContactPage extends ConsumerWidget {
 
     return SingleChildScrollView(
       padding: const EdgeInsets.fromLTRB(32, 16, 32, 24),
-      child: ConstrainedBox(
-        constraints: const BoxConstraints(maxWidth: 560),
+      child: PageBody(
         child: Column(crossAxisAlignment: CrossAxisAlignment.stretch, children: [
           Text(t.contactIntro, style: PangolinText.sm.copyWith(color: c.fg2)),
           const SizedBox(height: 16),