feat(translation): 为翻译模式选择器添加背景模糊效果

lib/modules/translation/views/translation_view.dart

@@ -1,4 +1,5 @@
 import 'dart:async';
+import 'dart:ui';
 
 import 'package:flutter/material.dart';
 import 'package:get/get.dart';
@@ -1072,7 +1073,10 @@ class TranslationView extends GetView<TranslationController> {
   // 显示翻译模式选择器
   void _showTranslationModeSelector(bool isDarkMode) {
     Get.bottomSheet(
-      _buildTranslationModeSelector(),
+      BackdropFilter(
+        filter: ImageFilter.blur(sigmaX: 10.0, sigmaY: 10.0),
+        child: _buildTranslationModeSelector(),
+      ),
       isScrollControlled: true,
       backgroundColor: Colors.transparent,
     );