Fix terminal auth bootstrap and account checkout gate

frontend/components/account/AccountCenter.tsx

@@ -410,7 +410,6 @@ export function AccountCenter() {
   const canTrialUpgrade = Boolean(isSubscribed && isTrialSubscription);
   const canOpenCheckoutOverlay = Boolean(
     paymentFeatureReady &&
-      !isSubscriptionUnknown &&
       (canTrialUpgrade || !isSubscribed || showExpiringSoon || showExpiredReminder),
   );
   const subscriptionStatusTitle = showExpiredReminder

frontend/components/account/__tests__/paymentShell.test.ts

@@ -253,6 +253,17 @@ export function runTests() {
       ),
     "account center must distinguish unknown subscription sync state from a confirmed unsubscribed account",
   );
+  assert(
+    !accountCenterSource.includes("paymentFeatureReady &&\n      !isSubscriptionUnknown") &&
+      !accountCenterSource.includes("paymentFeatureReady &&\r\n      !isSubscriptionUnknown"),
+    "account center must not block checkout when an authenticated user's subscription status is temporarily unknown",
+  );
+  assert(
+    accountFeatureSource.includes("状态待确认") &&
+      accountFeatureSource.includes("刷新或直接续费") &&
+      !accountFeatureSource.includes("订阅状态正在同步，请稍后刷新。"),
+    "account unknown subscription copy must tell users to refresh or renew instead of waiting indefinitely",
+  );
   assert(
     hookSource.includes("backendJson.authenticated === false") &&
       hookSource.includes("refreshSession()") &&

frontend/components/account/account-copy.ts

@@ -165,10 +165,10 @@ export function createAccountCopy(isEn: boolean): Record<string, string> {
         : "钱包已绑定，正在创建订单并发起支付...",
       proMember: "PRO MEMBER",
       proPendingSync: isEn ? "Activated (pending sync)" : "已开通（待同步）",
-      subscriptionChecking: isEn ? "Checking subscription" : "订阅同步中",
+      subscriptionChecking: isEn ? "Status pending" : "状态待确认",
       subscriptionUnknown: isEn
-        ? "Subscription status is syncing. Please refresh shortly."
-        : "订阅状态正在同步，请稍后刷新。",
+        ? "Subscription status is not confirmed yet. Refresh or renew directly."
+        : "订阅状态暂未确认，可刷新或直接续费。",
       noProSubscription: isEn ? "No Pro subscription" : "暂无 Pro 订阅",
       proEndsSoonTitle: isEn ? "Pro renewal due soon" : "Pro 即将到期",
       proEndsSoonBody: isEn