fix(nodes): 桌面 Nodes 页统一 600 宽度(原型挂 view-body + Flutter PageBody)+ 双列网格改单列镜像原型

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

client/lib/screens/nodes_page.dart

@@ -13,6 +13,7 @@ import '../state/nodes_provider.dart';
 import '../widgets/app_top_bar.dart';
 import '../widgets/country_code.dart';
 import '../widgets/pangolin_field.dart';
+import '../widgets/page_body.dart';
 import '../widgets/pangolin_icons.dart';
 import '../widgets/server_tile.dart';
 import '../widgets/smart_select_card.dart';
@@ -128,31 +129,32 @@ class _NodesPageState extends ConsumerState<NodesPage> {
     ]);
 
     if (widget.isWide) {
-      // 对照 dapp.jsx DServers：padding 4/28、网格 gap 10。智能卡置顶（CLAUDE.md §5 规范，三端一致）。
+      // 桌面 Nodes 页宽度统一为 view-body(600 居中)、单列 server-row 行列表——
+      // 镜像原型 design/prototype/screens/ui-desktop.html 的 .nodes-view(真相源)。
+      // 智能卡置顶（CLAUDE.md §5 规范，三端一致）。
       return RefreshIndicator(
         color: c.accent,
         backgroundColor: c.surface,
         onRefresh: _refresh,
-        child: ListView(
-          padding: const EdgeInsets.fromLTRB(28, 4, 28, 24),
-          children: [
-            smartCard,
-            const SizedBox(height: 14),
-            ConstrainedBox(constraints: const BoxConstraints(maxWidth: 440), child: searchRow),
-            const SizedBox(height: 14),
-            GridView.count(
-            crossAxisCount: 2,
-            shrinkWrap: true,
-            physics: const NeverScrollableScrollPhysics(),
-            mainAxisSpacing: 10,
-            crossAxisSpacing: 10,
-            childAspectRatio: 4.4,
+        child: PageBody(
+          child: ListView(
+            padding: const EdgeInsets.fromLTRB(28, 4, 28, 24),
             children: [
-              for (final n in nodes)
-                _NodeGridTile(node: n, lang: t.lang, active: !smart && n.code == selected, onTap: () => _onTapNode(n)),
+              smartCard,
+              const SizedBox(height: 14),
+              ConstrainedBox(constraints: const BoxConstraints(maxWidth: 440), child: searchRow),
+              const SizedBox(height: 14),
+              for (var i = 0; i < nodes.length; i++) ...[
+                _NodeGridTile(
+                  node: nodes[i],
+                  lang: t.lang,
+                  active: !smart && nodes[i].code == selected,
+                  onTap: () => _onTapNode(nodes[i]),
+                ),
+                if (i < nodes.length - 1) const SizedBox(height: 10),
+              ],
             ],
           ),
-        ],
         ),
       );
     }
@@ -226,7 +228,6 @@ class _SearchBox extends StatelessWidget {
   }
 }
 
-/// 宽屏双列网格中的节点块。
 /// 刷新按钮(搜索框右侧):点击刷新节点列表(受 10s 限流);刷新中显示 spinner。
 class _RefreshButton extends StatelessWidget {
   const _RefreshButton({required this.refreshing, required this.onTap});
@@ -256,6 +257,7 @@ class _RefreshButton extends StatelessWidget {
   }
 }
 
+/// 宽屏 Nodes 页单列节点行(镜像原型 .server-row)；自然高度撑高，不依赖网格 aspect ratio。
 class _NodeGridTile extends StatelessWidget {
   const _NodeGridTile({required this.node, required this.lang, required this.active, required this.onTap});
   final Node node;