fix: include actionable error details

src/app/(admin)/admin/error.tsx

@@ -2,6 +2,7 @@
 
 import { Button } from "@/components/ui/button";
 import { Card, CardContent } from "@/components/ui/card";
+import { getErrorMessage } from "@/lib/errors";
 
 export default function AdminError({
   error,
@@ -10,13 +11,18 @@ export default function AdminError({
   error: Error & { digest?: string };
   reset: () => void;
 }) {
+  const message = getErrorMessage(error, "管理后台页面加载失败");
+
   return (
     <div className="flex items-center justify-center min-h-[60vh]">
       <Card className="w-full max-w-md">
         <CardContent className="py-10 text-center space-y-5">
           <h1 className="text-xl font-semibold tracking-tight">出了点问题</h1>
-          <p className="text-sm text-destructive">
-            {error.message || "页面加载失败，请稍后重试。"}
+          <p className="text-sm leading-6 text-destructive break-words">
+            {message}
+          </p>
+          <p className="text-xs leading-5 text-muted-foreground">
+            如果重试后仍失败，请复制上面的错误详情给管理员排查。
           </p>
           <Button onClick={reset} className="h-10">重试</Button>
         </CardContent>

src/app/(admin)/admin/nodes/node-actions.tsx

@@ -72,7 +72,7 @@ export function NodeActions({ node, siteUrl }: { node: NodeActionValue; siteUrl:
               try {
                 const res = await testNodeConnection(node.id);
                 if (res.success) toast.success(res.message);
-                else toast.error(res.message);
+                else toast.error(getErrorMessage(res.message, "节点测试失败"));
               } catch (error) {
                 toast.error(getErrorMessage(error, "测试失败"));
               }

src/app/(admin)/admin/plans/plan-actions.tsx

@@ -5,6 +5,7 @@ import { Button } from "@/components/ui/button";
 import { ConfirmActionButton } from "@/components/shared/confirm-action-button";
 import { deletePlanPermanently, togglePlan } from "@/actions/admin/plans";
 import { toast } from "sonner";
+import { getErrorMessage } from "@/lib/errors";
 import {
   PlanForm,
   type PlanFormValue,
@@ -39,8 +40,7 @@ export function PlanActions({
             toast.success(isActive ? "套餐已下架" : "套餐已上架");
             router.refresh();
           } catch (error) {
-            const message = error instanceof Error ? error.message : "切换失败";
-            toast.error(message);
+            toast.error(getErrorMessage(error, "切换套餐上下架状态失败"));
           }
         }}
       >

src/app/(admin)/admin/settings/settings-form.tsx

@@ -59,7 +59,7 @@ export function SettingsForm({ config, coupons }: { config: AppConfig; coupons:
     try {
       const result = await saveAppSettings(new FormData(form));
       if (!result.ok) {
-        toast.error(result.error);
+        toast.error(getErrorMessage(result.error, "保存设置失败"));
         return;
       }
       clearPasswordField(form);
@@ -86,8 +86,8 @@ export function SettingsForm({ config, coupons }: { config: AppConfig; coupons:
         }
         toast.error(
           result.settingsSaved
-            ? `设置已保存，但测试邮件没有发出：${result.error}`
-            : result.error,
+            ? `设置已保存，但测试邮件没有发出：${getErrorMessage(result.error, "测试邮件发送失败")}`
+            : getErrorMessage(result.error, "测试邮件发送失败"),
         );
         return;
       }