refactor(pairing): 重构配对页面布局结构

将配对页面的主要内容拆分为固定顶部区域和可滚动内容区域，提高代码可维护性
同时优化翻译模式选择器的位置计算逻辑

lib/modules/pairing/views/pairing_view.dart

@@ -72,56 +72,60 @@ class _PairingViewState extends State<PairingView>
     return Scaffold(
       backgroundColor: isDarkMode ? Colors.black : Colors.white,
       body: SafeArea(
-        child: _buildMainContent(isDarkMode),
+        child: Column(
+          children: [
+            // 固定顶部区域 - 不受下方内容影响
+            _buildFixedTopSection(isDarkMode),
+
+            // 可滚动的动态内容区域
+            Expanded(
+              child: _buildDynamicContentSection(isDarkMode),
+            ),
+          ],
+        ),
       ),
-      // bottomNavigationBar: Opacity(
-      //   opacity: 0.5,
-      //   child: const CommonBottomNav(currentIndex: 0),
-      // ),
     );
   }
 
-  // 主要内容
-  Widget _buildMainContent(bool isDarkMode) {
-    return Container(
-      width: double.infinity,
-      height: MediaQuery.of(Get.context!).size.height,
-      padding: EdgeInsets.symmetric(horizontal: 24.w),
-      // 添加SingleChildScrollView以防止溢出
-      child: SingleChildScrollView(
-        physics: const BouncingScrollPhysics(),
-        child: ConstrainedBox(
-          constraints: BoxConstraints(
-            minHeight:
-                MediaQuery.of(Get.context!).size.height - 100.h, // 减去底部导航和状态栏高度
-          ),
-          child: Column(
-            mainAxisAlignment: MainAxisAlignment.center,
-            crossAxisAlignment: CrossAxisAlignment.center,
-            children: [
-              SizedBox(height: 20.h), // 顶部间距
-
-              // 标题部分
-              _buildHeader(isDarkMode),
-
-              SizedBox(height: 20.h),
+  // 固定顶部区域
+  Widget _buildFixedTopSection(bool isDarkMode) {
+    return Padding(
+      padding: EdgeInsets.only(top: 60.h, left: 24.w, right: 24.w),
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          // 标题部分
+          _buildHeader(isDarkMode),
+          SizedBox(height: 20.h),
 
-              // 设备动画 - 根据状态显示不同动画
-              _buildDeviceAnimation(isDarkMode),
+          _buildDeviceAnimation(isDarkMode),
+        ],
+      ),
+    );
+  }
 
-              SizedBox(height: 20.h),
+  // 动态内容区域
+  Widget _buildDynamicContentSection(bool isDarkMode) {
+    return SingleChildScrollView(
+      physics: const BouncingScrollPhysics(),
+      child: Padding(
+        padding: EdgeInsets.symmetric(horizontal: 24.w),
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.start,
+          crossAxisAlignment: CrossAxisAlignment.center,
+          children: [
+            SizedBox(height: 30.h),
 
-              // 状态信息
-              _buildStatusInfo(isDarkMode),
+            // 状态信息
+            _buildStatusInfo(isDarkMode),
 
-              SizedBox(height: 40.h),
+            SizedBox(height: 40.h),
 
-              // 底部按钮
-              _buildActionButtons(isDarkMode),
+            // 底部按钮
+            _buildActionButtons(isDarkMode),
 
-              SizedBox(height: 20.h),
-            ],
-          ),
+            SizedBox(height: 20.h),
+          ],
         ),
       ),
     );

lib/modules/translation/controllers/translation_controller.dart

@@ -288,14 +288,13 @@ class TranslationController extends GetxController with WidgetsBindingObserver {
     WidgetsBinding.instance.addObserver(this);
 
     // 延迟显示模式选择器，确保页面已经完全加载
-    // Future.delayed(const Duration(milliseconds: 100), () {
-    //   _showModeSelector();
-    // });
-    //确保关键服务初始化完成
     WidgetsBinding.instance.addPostFrameCallback((_) async {
       // 确保上下文有效
       if (Get.context == null || !Get.context!.mounted) return;
+
+      // Future.delayed(const Duration(milliseconds: 200), () {
       _showModeSelector();
+      // });
     });
   }
 

lib/modules/translation/views/dialogs/translation_mode_selector.dart

@@ -14,12 +14,14 @@ class TranslationModeSelector {
     // 总是从悬浮按钮位置展开，不依赖传入的anchor参数
     final Size screenSize = MediaQuery.of(Get.context!).size;
     final Offset floatingButtonPos = controller.floatingButtonPosition.value;
-    
+
     // 计算悬浮按钮的中心点位置（从右下角偏移转换为屏幕坐标）
-    final double buttonSize = 56.0; // 悬浮按钮的大小
-    final double buttonCenterX = screenSize.width - floatingButtonPos.dx - buttonSize / 2;
-    final double buttonCenterY = screenSize.height - floatingButtonPos.dy - buttonSize / 2;
-    
+    final double buttonSize = 56.0.w; // 悬浮按钮的大小
+    final double buttonCenterX =
+        screenSize.width - floatingButtonPos.dx - buttonSize / 2;
+    final double buttonCenterY =
+        screenSize.height - floatingButtonPos.dy - buttonSize / 2;
+
     // 计算缩放对齐点（-1..1）
     final double ax = (buttonCenterX / screenSize.width) * 2 - 1;
     final double ay = (buttonCenterY / screenSize.height) * 2 - 1;