refactor(desktop): narrow home health board to expired/revoked accounts

Home 看板只保留已过期或已停用的账号，问题计数改用阻塞态 authState；新增 formatVerifiedAtLabel，统一校验通过时间的展示粒度。

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/desktop-client/src/renderer/views/AiPlatformsView.vue

@@ -11,7 +11,7 @@ import { computed, ref } from "vue";
 
 import { useDesktopRuntime } from "../composables/useDesktopRuntime";
 import { showClientActionError } from "../lib/client-errors";
-import { formatDateTime, formatRelativeTime } from "../lib/formatters";
+import { formatDateTime, formatRelativeTime, formatVerifiedAtLabel } from "../lib/formatters";
 import { desktopMonitoringMediaCatalog } from "../lib/media-catalog";
 import type { RuntimeAccount } from "../types";
 
@@ -90,7 +90,7 @@ function authColor(account: AccountRow | null) {
 
 function verificationLabel(account: AccountRow): string {
   if (account.lastVerifiedAt) {
-    return `${formatRelativeTime(account.lastVerifiedAt)}校验通过`;
+    return formatVerifiedAtLabel(account.lastVerifiedAt);
   }
   if (account.probeState === "probing") {
     return "正在执行首轮校验";