refactor(translation): 重构翻译模式选择器的显示逻辑

移除自动显示模式选择器的延迟逻辑，改为在点击按钮时计算位置显示
恢复模式选择器中的关闭按钮
修复模式选择后自动开始识别的问题

lib/modules/translation/controllers/translation_controller.dart

@@ -410,14 +410,12 @@ 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
-    WidgetsBinding.instance.addPostFrameCallback((_) async {
-      // 确保上下文有效
-      if (Get.context == null || !Get.context!.mounted) return;
+    // 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();
-      // });
-    });
+    //   _showModeSelector();
+    // });
   }
 
   /// 预先检查权限

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

@@ -10,22 +10,29 @@ class TranslationModeSelector {
   /// 显示翻译模式选择器
   static void show(bool isDarkMode, {Offset? anchor}) {
     final controller = Get.find<TranslationController>();
-
-    // 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.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;
+    Alignment alignment;
+
+    if (anchor != null) {
+      // 使用传入的锚点计算对齐点
+      final double ax = (anchor.dx / screenSize.width) * 2 - 1;
+      final double ay = (anchor.dy / screenSize.height) * 2 - 1;
+      alignment = Alignment(ax, ay);
+    } else {
+      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.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;
-    final Alignment alignment = Alignment(ax, ay);
+      // 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;
+      alignment = Alignment(ax, ay);
+    }
 
     Get.generalDialog(
       barrierLabel: 'translation_mode_selector',
@@ -93,7 +100,7 @@ class TranslationModeSelector {
                   Get.back();
                   await controller.stopAll();
                   await controller.changeTranslationMode('simultaneous');
-                  //await controller.startRecognition();
+                  await controller.startRecognition();
                 },
               ),
               _buildModeItem(
@@ -106,7 +113,7 @@ class TranslationModeSelector {
                   Get.back();
                   await controller.stopAll();
                   await controller.changeTranslationMode('faceToFace');
-                  //await controller.startRecognition();
+                  await controller.startRecognition();
                 },
               ),
               _buildModeItem(
@@ -120,7 +127,7 @@ class TranslationModeSelector {
                         Get.back();
                         await controller.stopAll();
                         await controller.changeTranslationMode('audioVideo');
-                        //await controller.startRecognition();
+                        await controller.startRecognition();
                       }
                     : null,
               ),
@@ -135,23 +142,23 @@ class TranslationModeSelector {
                         Get.back();
                         await controller.stopAll();
                         await controller.changeTranslationMode('call');
-                        //await controller.startRecognition();
+                        await controller.startRecognition();
                       }
                     : null,
               ),
-              SizedBox(height: 64.w),
-              // GestureDetector(
-              //   onTap: () => Get.back(),
-              //   child: Container(
-              //     width: 42,
-              //     height: 42,
-              //     decoration: BoxDecoration(
-              //       color: Colors.black.withValues(alpha: 0.8),
-              //       borderRadius: BorderRadius.circular(50),
-              //     ),
-              //     child: const Icon(Icons.close, color: Colors.white),
-              //   ),
-              // ),
+              SizedBox(height: 24.w),
+              GestureDetector(
+                onTap: () => Get.back(),
+                child: Container(
+                  width: 42,
+                  height: 42,
+                  decoration: BoxDecoration(
+                    color: Colors.black.withValues(alpha: 0.8),
+                    borderRadius: BorderRadius.circular(50),
+                  ),
+                  child: const Icon(Icons.close, color: Colors.white),
+                ),
+              ),
               if (Platform.isAndroid) SizedBox(height: 20.h),
             ],
           ),

lib/modules/translation/views/translation_view.dart

@@ -45,10 +45,10 @@ class TranslationView extends GetView<TranslationController> {
           children: [
             _buildBody(isDarkMode),
             // 可拖拽的悬浮按钮
-            DraggableFloatingButton(
-              isDarkMode: isDarkMode,
-              controller: controller,
-            ),
+            // DraggableFloatingButton(
+            //   isDarkMode: isDarkMode,
+            //   controller: controller,
+            // ),
           ],
         ),
       );
@@ -633,7 +633,26 @@ class TranslationView extends GetView<TranslationController> {
                         if (isRecognizing) {
                           controller.stopAll();
                         } else {
-                          controller.startRecognition();
+                          // 获取底部按钮的位置
+                          if (controlBarKey.currentContext != null) {
+                            final RenderBox renderBox =
+                                controlBarKey.currentContext!.findRenderObject()
+                                    as RenderBox;
+                            final buttonPosition =
+                                renderBox.localToGlobal(Offset.zero);
+                            final buttonSize = renderBox.size;
+
+                            // 计算按钮中心点
+                            final Offset anchor = buttonPosition +
+                                Offset(buttonSize.width / 2,
+                                    buttonSize.height / 2);
+                            TranslationModeSelector.show(isDarkMode,
+                                anchor: anchor);
+
+                            //controller.startRecognition();
+                          } else {
+                            TranslationModeSelector.show(isDarkMode);
+                          }
                         }
                       },
                       child: Container(