登录页面自动检查状态，未登录时才显示二维码区域

- 挂载时先 checkLoginCookie（轻量，不开浏览器）
- 有 cookie 则调 refreshStatus 验证实际状态，完成后标记 initialCheckDone
- 无 cookie 直接标记 initialCheckDone（确定未登录，无需开浏览器）
- 二维码登录卡片仅在 initialCheckDone=true 且未登录时渲染，检查期间不显示

web/src/pages/LoginPage.tsx

@@ -14,14 +14,23 @@ export function LoginPage() {
   const { token } = useAuth();
   const { toast } = useToast();
 
+  // Whether the initial login check has completed (used to decide when to show QR section)
+  const [initialCheckDone, setInitialCheckDone] = useState(false);
+
   // Auto-check cookie on mount (lightweight, no browser opened)
   useEffect(() => {
     if (!token) return;
     void checkLoginCookie().then((res) => {
       if (res.success && res.data?.hasCookies) {
-        void refreshStatus(); // Only open browser if cookies exist
+        // Cookies exist — open browser to verify actual login state
+        void refreshStatus().finally(() => setInitialCheckDone(true));
+      } else {
+        // No cookies — definitely not logged in, no need to open a browser
+        setInitialCheckDone(true);
       }
-    }).catch(() => {});
+    }).catch(() => {
+      setInitialCheckDone(true);
+    });
   }, [token, refreshStatus]);
   const navigate = useNavigate();
 
@@ -167,53 +176,55 @@ export function LoginPage() {
         </div>
       </Card>
 
-      {/* QR Code Login */}
-      <Card>
-        <h2 className="text-sm font-semibold text-dark-muted uppercase tracking-wider mb-4">
-          二维码登录
-        </h2>
+      {/* QR Code Login — only shown after check completes and user is not logged in */}
+      {token && initialCheckDone && !status?.loggedIn && (
+        <Card>
+          <h2 className="text-sm font-semibold text-dark-muted uppercase tracking-wider mb-4">
+            二维码登录
+          </h2>
 
-        {!qrData && !qrLoading && (
-          <div className="text-center py-8">
-            <p className="text-dark-muted mb-4">点击按钮生成登录二维码</p>
-            <Button onClick={() => void handleGetQR()} disabled={status?.loggedIn}>
-              获取二维码
-            </Button>
-          </div>
-        )}
-
-        {qrLoading && (
-          <div className="flex flex-col items-center py-8 gap-3">
-            <Spinner size="lg" />
-            <p className="text-sm text-dark-muted">生成二维码中...</p>
-          </div>
-        )}
-
-        {qrData && (
-          <div className="flex flex-col items-center gap-4">
-            <div className="bg-white rounded-xl p-4">
-              <img src={qrData} alt="登录二维码" className="w-64 h-64" />
+          {!qrData && !qrLoading && (
+            <div className="text-center py-8">
+              <p className="text-dark-muted mb-4">点击按钮生成登录二维码</p>
+              <Button onClick={() => void handleGetQR()}>
+                获取二维码
+              </Button>
             </div>
-            <p className="text-sm text-dark-muted">使用小红书 App 扫码登录</p>
-            {polling && (
-              <div className="flex items-center gap-3">
-                <Spinner size="sm" />
-                <span className="text-sm text-dark-accent">
-                  等待扫码... {formatCountdown(countdown)}
-                </span>
+          )}
+
+          {qrLoading && (
+            <div className="flex flex-col items-center py-8 gap-3">
+              <Spinner size="lg" />
+              <p className="text-sm text-dark-muted">生成二维码中...</p>
+            </div>
+          )}
+
+          {qrData && (
+            <div className="flex flex-col items-center gap-4">
+              <div className="bg-white rounded-xl p-4">
+                <img src={qrData} alt="登录二维码" className="w-64 h-64" />
+              </div>
+              <p className="text-sm text-dark-muted">使用小红书 App 扫码登录</p>
+              {polling && (
+                <div className="flex items-center gap-3">
+                  <Spinner size="sm" />
+                  <span className="text-sm text-dark-accent">
+                    等待扫码... {formatCountdown(countdown)}
+                  </span>
+                </div>
+              )}
+              <div className="flex gap-2">
+                <Button variant="ghost" size="sm" onClick={() => void handleGetQR()}>
+                  刷新二维码
+                </Button>
+                <Button variant="ghost" size="sm" onClick={stopPolling}>
+                  取消
+                </Button>
               </div>
-            )}
-            <div className="flex gap-2">
-              <Button variant="ghost" size="sm" onClick={() => void handleGetQR()}>
-                刷新二维码
-              </Button>
-              <Button variant="ghost" size="sm" onClick={stopPolling}>
-                取消
-              </Button>
             </div>
-          </div>
-        )}
-      </Card>
+          )}
+        </Card>
+      )}
     </div>
   );
 }