feat(translation): 添加翻译记录删除功能

- 在翻译记录项右侧添加删除按钮
- 实现删除确认对话框及删除功能
- 添加删除成功/失败的提示反馈

lib/modules/translation/views/translation_view.dart

@@ -355,13 +355,34 @@ class TranslationView extends GetView<TranslationController> {
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
-          // 源文本
-          Text(
-            item.sourceText,
-            style: TextStyle(
-              fontSize: 16,
-              color: Theme.of(context).textTheme.bodyLarge?.color,
-            ),
+          // 源文本和删除按钮行
+          Row(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              // 源文本
+              Expanded(
+                child: Text(
+                  item.sourceText,
+                  style: TextStyle(
+                    fontSize: 16,
+                    color: Theme.of(context).textTheme.bodyLarge?.color,
+                  ),
+                ),
+              ),
+              // 删除按钮 - 只对完成态记录显示，与源文本平齐
+              if (!item.isIntermediate)
+                GestureDetector(
+                  onTap: () => _showDeleteItemConfirmDialog(item),
+                  child: Container(
+                    padding: EdgeInsets.all(4.w),
+                    child: Icon(
+                      Icons.delete_outline,
+                      size: 18.sp,
+                      color: Colors.grey[500],
+                    ),
+                  ),
+                ),
+            ],
           ),
           if (item.translatedText.isNotEmpty) ...[
             const SizedBox(height: 8),
@@ -380,20 +401,26 @@ class TranslationView extends GetView<TranslationController> {
           Row(
             mainAxisAlignment: MainAxisAlignment.spaceBetween,
             children: [
-              Text(
-                '${item.sourceLanguageName.tr} → ${item.targetLanguageName.tr}',
-                style: TextStyle(
-                  fontSize: 12,
-                  color: Theme.of(context).textTheme.bodySmall?.color,
+              Expanded(
+                child: Text(
+                  '${item.sourceLanguageName.tr} → ${item.targetLanguageName.tr}',
+                  style: TextStyle(
+                    fontSize: 12,
+                    color: Theme.of(context).textTheme.bodySmall?.color,
+                  ),
                 ),
               ),
+              // 播放按钮
               if (!item.isIntermediate)
                 GestureDetector(
                   onTap: () => controller.playTranslationItem(item),
-                  child: Icon(
-                    Icons.volume_up,
-                    size: 20,
-                    color: Theme.of(context).colorScheme.primary,
+                  child: Container(
+                    padding: EdgeInsets.all(4.w),
+                    child: Icon(
+                      Icons.volume_up,
+                      size: 20.sp,
+                      color: Theme.of(context).colorScheme.primary,
+                    ),
                   ),
                 ),
             ],
@@ -839,4 +866,136 @@ class TranslationView extends GetView<TranslationController> {
       }
     });
   }
+
+  // 显示删除单条记录确认对话框
+  void _showDeleteItemConfirmDialog(TranslationItem item) {
+    final isDarkMode = Theme.of(Get.context!).brightness == Brightness.dark;
+
+    Get.dialog(
+      AlertDialog(
+        backgroundColor: isDarkMode ? AppColors.cardBackground : Colors.white,
+        title: Text(
+          'deleteTranslationRecord'.tr, // 删除翻译记录
+          style: TextStyle(
+            fontSize: 18.sp,
+            fontWeight: FontWeight.bold,
+            color: isDarkMode ? Colors.white : Colors.black,
+          ),
+        ),
+        content: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Text(
+              'deleteTranslationConfirm'.tr, // 确定要删除这条翻译记录吗？此操作无法撤销。
+              style: TextStyle(
+                fontSize: 16.sp,
+                color: isDarkMode ? Colors.grey[300] : Colors.black87,
+              ),
+            ),
+            SizedBox(height: 12.h),
+            // 显示要删除的记录预览
+            Container(
+              padding: EdgeInsets.all(12.w),
+              decoration: BoxDecoration(
+                color: isDarkMode
+                    ? Colors.grey[800]?.withOpacity(0.5)
+                    : Colors.grey[100],
+                borderRadius: BorderRadius.circular(8.r),
+                border: Border.all(
+                  color: isDarkMode ? Colors.grey[700]! : Colors.grey[300]!,
+                  width: 1,
+                ),
+              ),
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  Text(
+                    item.sourceText,
+                    style: TextStyle(
+                      fontSize: 14.sp,
+                      color: isDarkMode ? Colors.white : Colors.black,
+                      fontWeight: FontWeight.w500,
+                    ),
+                    maxLines: 2,
+                    overflow: TextOverflow.ellipsis,
+                  ),
+                  if (item.translatedText.isNotEmpty) ...[
+                    SizedBox(height: 4.h),
+                    Text(
+                      item.translatedText,
+                      style: TextStyle(
+                        fontSize: 14.sp,
+                        color: isDarkMode ? Colors.grey[300] : Colors.grey[700],
+                      ),
+                      maxLines: 2,
+                      overflow: TextOverflow.ellipsis,
+                    ),
+                  ],
+                ],
+              ),
+            ),
+          ],
+        ),
+        actions: [
+          TextButton(
+            onPressed: () => Get.back(),
+            child: Text(
+              'cancel'.tr,
+              style: TextStyle(
+                fontSize: 16.sp,
+                color: isDarkMode ? Colors.grey[400] : Colors.grey[700],
+              ),
+            ),
+          ),
+          TextButton(
+            onPressed: () {
+              Get.back();
+              // 删除指定的翻译记录
+              _deleteTranslationItem(item);
+            },
+            child: Text(
+              'confirm'.tr,
+              style: TextStyle(
+                fontSize: 16.sp,
+                color: Colors.red,
+                fontWeight: FontWeight.bold,
+              ),
+            ),
+          ),
+        ],
+        shape: RoundedRectangleBorder(
+          borderRadius: BorderRadius.circular(12.r),
+        ),
+      ),
+    );
+  }
+
+  // 删除翻译记录的具体实现
+  void _deleteTranslationItem(TranslationItem item) {
+    try {
+      // 调用控制器的删除方法
+      controller.deleteTranslationItem(item.sessionId, item.timestamp);
+
+      // 显示删除成功提示
+      Get.snackbar(
+        '删除成功', // deleteSuccess
+        '已删除该翻译记录', // deleteTranslationSuccess
+        snackPosition: SnackPosition.BOTTOM,
+        backgroundColor: Get.isDarkMode ? Colors.grey[800] : Colors.grey[200],
+        colorText: Get.isDarkMode ? Colors.white : Colors.black,
+        duration: const Duration(seconds: 2),
+      );
+    } catch (e) {
+      // 显示删除失败提示
+      Get.snackbar(
+        '删除失败', // deleteFailed
+        '删除翻译记录时发生错误: ${e.toString()}', // deleteTranslationError
+        snackPosition: SnackPosition.BOTTOM,
+        backgroundColor: Colors.red[400],
+        colorText: Colors.white,
+        duration: const Duration(seconds: 3),
+      );
+    }
+  }
 }