fix: 优化删除账号code传4，修改常见问题文案，禁用输入框悬浮按钮，修复登录ios输入框聚焦问题

lib/app/modules/hi_help/controllers/hi_help_controller.dart

@@ -60,9 +60,9 @@ class HIHelpController extends GetxController {
     KRMessage(
       title: '设备与绑定问题',
       content: [
-        '在绑定新设备之前请先添加您的邮箱。',
+        '在绑定新设备之前请先添加您的邮箱并设置账户密码。',
         'Hi快VPN支持最多两台设备同时在线，包括一台iOS设备或Android，加一台Mac或PC。',
-        '如超出设备数量限制，最早登陆的同类设备将会自动下线，需要重新登陆，设备限制为系统固定设定，不支持调整。',
+        '如超出设备数量限制，请先手动移除设备后再进行登录，设备限制为系统固定设定，不支持调整。',
       ],
     ),
     KRMessage(

lib/app/modules/kr_delete_account/controllers/kr_delete_account_controller.dart

@@ -58,7 +58,7 @@ class KRDeleteAccountController extends GetxController {
     // 发送验证码（简化后的 API 只需要 email 和 type）
     final result = await _authApi.kr_sendCode(
       account,  // 邮箱地址
-      2,  // 删除账号的验证码类型
+      4,  // 删除账号的验证码类型
     );
 
     result.fold(

lib/app/modules/kr_delete_account/views/kr_delete_account_view.dart

@@ -159,6 +159,7 @@ class KRDeleteAccountView extends GetView<KRDeleteAccountController> {
       height: 50.w,
       child: TextField(
         controller: controller.kr_codeController,
+        contextMenuBuilder: (context, editableTextState) => const SizedBox.shrink(),
         keyboardType: TextInputType.number,
         textInputAction: TextInputAction.done,
         autofillHints: const [AutofillHints.oneTimeCode],

lib/app/modules/kr_invite/views/kr_invite_view.dart

@@ -169,6 +169,7 @@ class KRInviteView extends GetView<KRInviteController> {
                                     RepaintBoundary(
                                       child: TextField(
                                         controller: controller.otherInviteCodeController,
+                                        contextMenuBuilder: (context, editableTextState) => const SizedBox.shrink(),
                                         textInputAction: TextInputAction.done,
                                         onSubmitted: (_) => controller.kr_handleBindInviteCode(),
                                         textAlign: TextAlign.center,

lib/app/modules/kr_login/views/kr_login_view.dart

@@ -125,7 +125,7 @@ class KRLoginView extends GetView<KRLoginController> {
           child: Column(
             children: [
               Obx(() => _buildStandardInputField(
-                    controller: controller.accountController,
+                    textController: controller.accountController,
                     hintText: '请输入邮箱地址',
                     suffixes: const [
                       '@gmail.com',
@@ -161,7 +161,7 @@ class KRLoginView extends GetView<KRLoginController> {
 
   /// 构建标准输入框
   Widget _buildStandardInputField({
-    required TextEditingController controller,
+    required TextEditingController textController,
     required String hintText,
     bool isPassword = false,
     List<String>? suffixes,
@@ -173,8 +173,9 @@ class KRLoginView extends GetView<KRLoginController> {
       VoidCallback? onEditingComplete,
     }) {
       return TextField(
-        controller: controller,
+        controller: textController,
         focusNode: focusNode,
+        contextMenuBuilder: (context, editableTextState) => const SizedBox.shrink(),
         onEditingComplete: onEditingComplete,
         obscureText: isPassword,
         style: KrAppTextStyle(
@@ -217,8 +218,8 @@ class KRLoginView extends GetView<KRLoginController> {
     // 使用 RawAutocomplete 实现带提示的输入框
     return SizedBox(
       child: RawAutocomplete<String>(
-        textEditingController: controller,
+        textEditingController: textController,
-        focusNode: FocusNode(),
+        focusNode: this.controller.kr_accountFocusNode,
         optionsBuilder: (TextEditingValue textEditingValue) {
           final inputText = textEditingValue.text;
 
@@ -228,15 +229,10 @@ class KRLoginView extends GetView<KRLoginController> {
           // 1. 匹配历史记录 (只要输入内容匹配历史记录的开头，或者输入为空)
           if (historyEmails != null) {
             if (inputText.isEmpty) {
-              // 理论上 RawAutocomplete 默认不显示空输入的 options，除非自定义 fieldViewBuilder 监听
-              // 但 RawAutocomplete 的 optionsBuilder 在 text 变化时触发。
-              // 若要空内容显示，通常需要 Focus 触发。这里先处理有内容的情况，
-              // 或者如果 RawAutocomplete 支持空内容（通过 initialValue? 不行，得看 triggerMode）
-              // 简单处理：如果为空，返回所有历史记录
               options.addAll(historyEmails);
             } else {
-              options.addAll(historyEmails
+              options.addAll(
-                  .where((email) => email.startsWith(inputText)));
+                  historyEmails.where((email) => email.startsWith(inputText)));
             }
           }
 
@@ -260,15 +256,16 @@ class KRLoginView extends GetView<KRLoginController> {
         },
         fieldViewBuilder: (
           BuildContext context,
-          TextEditingController textEditingController,
+          TextEditingController
+              textEditingController, // This textEditingController is provided by RawAutocomplete
           FocusNode focusNode,
           VoidCallback onFieldSubmitted,
         ) {
-          // 这里我们使用传入的 controller，而不是 fieldViewBuilder 提供的 textEditingController
+          // Here we use the passed in textController, not the textEditingController provided by fieldViewBuilder
-          // 因为我们需要外部控制 controller。
+          // because we need to control the textController externally.
-          // 注意：RawAutocomplete 默认会监听 textEditingController，
+          // Note: RawAutocomplete listens to textEditingController by default,
-          // 如果我们传入了自己的 controller 给 RawAutocomplete，
+          // if we pass our own textController to RawAutocomplete,
-          // fieldViewBuilder 的 textEditingController 其实就是我们传入的那个。
+          // the fieldViewBuilder's textEditingController is actually the one we passed.
           return buildTextField(
             focusNode: focusNode,
             onEditingComplete: onFieldSubmitted,
@@ -338,6 +335,7 @@ class KRLoginView extends GetView<KRLoginController> {
       height: 50, // 固定高度
       child: TextField(
         controller: controller.codeController,
+        contextMenuBuilder: (context, editableTextState) => const SizedBox.shrink(),
         keyboardType: TextInputType.number,
         textInputAction: TextInputAction.done,
         autofillHints: const [AutofillHints.oneTimeCode],