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/purchase_page.dart

@@ -9,6 +9,7 @@ import '../l10n/app_text.dart';
 import '../models/payment.dart';
 import '../pangolin_theme.dart';
 import '../state/payment_provider.dart';
+import '../widgets/page_body.dart';
 import '../widgets/pangolin_icons.dart';
 import '../widgets/pangolin_toast.dart';
 import '../widgets/plan_card.dart';
@@ -70,7 +71,7 @@ class _PurchaseScreenState extends ConsumerState<PurchaseScreen> {
     final c = context.pangolin;
     final catalog = ref.watch(payCatalogProvider);
 
-    final body = catalog.when(
+    final body = PageBody(wide: true, child: catalog.when(
       loading: () => const Center(
           child: Padding(padding: EdgeInsets.all(40), child: CircularProgressIndicator())),
       error: (_, __) => Center(
@@ -132,7 +133,7 @@ class _PurchaseScreenState extends ConsumerState<PurchaseScreen> {
           ],
         );
       },
-    );
+    ));
 
     if (widget.embedded) return body;
     return Scaffold(