修复：区分通知加载失败与空列表

app/lib/useMailbox.js

@@ -7,6 +7,7 @@ function i() {
   let i = useState(`mail-unread-count`, () => 0),
     a = useState(`mail-recent`, () => []),
     o = useState(`mail-types`, () => []),
+    status = useState(`mail-status`, () => `idle`),
     s = useState(`mail-session`, () => null),
     c = useState(`mail-request-id`, () => 0),
     l = useAuth(),
@@ -19,31 +20,37 @@ function i() {
         (c.value += 1),
         (i.value = 0),
         (a.value = []),
-        (o.value = []));
+        (o.value = []),
+        (status.value = `idle`));
     },
     {
       immediate: !0,
       flush: `sync`,
     },
   );
-  // 接口现有摘要位于 credit_limit 字段；失败保留本会话既有摘要，不中断页面主流程。
+  // 失败可保留本会话摘要，但必须显式标为不可用；只有成功的空结果才是暂无通知。
   async function d() {
     if (!l.token) return;
     let e = l.token,
       t = ++c.value;
+    status.value = `loading`;
     try {
       let n = await u.get(`/client_care/mail`);
       if (e !== l.token || t !== c.value) return;
       let r = n?.credit_limit;
       ((i.value = Number(r?.count ?? 0)),
         (a.value = r?.list ?? []),
-        (o.value = r?.type ?? []));
-    } catch {}
+        (o.value = r?.type ?? []),
+        (status.value = `success`));
+    } catch {
+      if (e === l.token && t === c.value) status.value = `error`;
+    }
   }
   return {
     count: i,
     recent: a,
     types: o,
+    status,
     refresh: d,
   };
 }