fix(login)：checkbox连点问题

@@ -48,7 +48,17 @@ class LoginController extends GetxController {
 
   AppleSignInModel? appleSignInModel;
 
+  DateTime? _lastToggleTime;
+
   Future<void> toggleTermsChecked() async {
+    // 防抖：300ms 内的重复调用直接忽略，防止积压的手势事件互相抵消勾选状态
+    final now = DateTime.now();
+    if (_lastToggleTime != null &&
+        now.difference(_lastToggleTime!) < const Duration(milliseconds: 300)) {
+      return;
+    }
+    _lastToggleTime = now;
+
     final newValue = !termsChecked.value;
     termsChecked.value = newValue;
     try {
@@ -56,6 +66,8 @@ class LoginController extends GetxController {
       await local.setTermsAgreed(newValue);
       if (newValue) {
         unawaited(() async {
+          // 等待 Flutter 完成当前帧渲染，让勾选图标先显示
+          await WidgetsBinding.instance.endOfFrame;
           if (!_userStateService.sdksInitialized) {
             await _userStateService.initializeSdks();
           }