refactor(share): 优化分享底部弹窗代码结构与权限校验

- 新增思维导图操作类型常量类，提升代码可读性
- 提取转写与总结权限判定逻辑，简化权限判断
- 实现文件名非法字符过滤，避免文件创建异常
- 抽象思维导图保存与分享操作为统一方法，减少重复代码
- 统一分享和导出失败提示，增加详细日志记录
- 替换硬编码权限判断为封装属性
- 对导出文件命名应用安全文件名处理，防止路径错误
- 优化WebView截图异步处理逻辑，提升稳定性

lib/modules/meeting/views/bottomSheet/share_bottom_sheet.dart

@@ -1,3 +1,4 @@
+import 'dart:convert';
 import 'dart:io';
 
 import 'package:common_utils/common_utils.dart';
@@ -13,6 +14,7 @@ import 'package:share_plus/share_plus.dart';
 
 import 'package:webview_flutter/webview_flutter.dart';
 
+import '../../../../core/utils/logger.dart';
 import '../../../../data/services/network/dio_manager.dart';
 import '../../controllers/meeting_details_controller.dart';
 import '../../controllers/mind_map_controller.dart';
@@ -37,6 +39,15 @@ import 'second_level_bottom_sheet.dart';
 /// - 复制/导出/思维导图功能需要 tasktype >= 5 且 tasktype < 10001
 /// ============================================================================
 
+/// 思维导图操作类型常量
+class _MindMapActionType {
+  /// 保存到本地相册
+  static const int save = 1;
+
+  /// 分享给他人
+  static const int share = 2;
+}
+
 /// 分享底部弹窗 - 有状态组件
 /// 使用StatefulWidget以便在build方法中多次获取主题状态
 class ShareBottomSheet extends StatefulWidget {
@@ -73,6 +84,44 @@ class _ShareBottomSheetState extends State<ShareBottomSheet> {
     );
   }
 
+  /// 是否有转写权限（tasktype >= 3 且 tasktype < 10002）
+  bool get _hasTranscriptPermission {
+    final tasktype = _controller.meetingDetails.value.tasktype;
+    return tasktype >= 3 && tasktype < 10002;
+  }
+
+  /// 是否有总结权限（tasktype >= 5 且 tasktype < 10001）
+  bool get _hasSummaryPermission {
+    final tasktype = _controller.meetingDetails.value.tasktype;
+    return tasktype >= 5 && tasktype < 10001;
+  }
+
+  /// 清理文件名中的非法字符
+  /// 过滤 / \ : * ? " < > | 等文件系统不允许的字符
+  String _sanitizeFileName(String name) {
+    return name.replaceAll(RegExp(r'[/\\:*?"<>|]'), '_');
+  }
+
+  /// 处理思维导图操作（保存/分享）
+  /// [actionType] 操作类型，使用 [_MindMapActionType] 常量
+  void _handleMindMapAction(int actionType) {
+    Get.back();
+    final mindMapController = Get.find<MindMapController>();
+    mindMapController.imageType = actionType;
+    if (mindMapController.isWebViewReady) {
+      mindMapController.webViewController.runJavaScript('captureImage()');
+    } else {
+      mindMapController.webViewController.setNavigationDelegate(
+        NavigationDelegate(
+          onPageFinished: (String url) {
+            mindMapController.isWebViewReady = true;
+            mindMapController.webViewController.runJavaScript('captureImage()');
+          },
+        ),
+      );
+    }
+  }
+
   /// ==========================================================================
   /// 构建UI界面
   /// ==========================================================================
@@ -192,8 +241,9 @@ class _ShareBottomSheetState extends State<ShareBottomSheet> {
                                 'shareSuccess'.tr); // 对应中文：分享完成
                           }
                         } catch (e) {
-                          EasyLoading.showToast('shareFailed'.tr.replaceAll(
+                          Logger.error('分享链接失败', e); // 技术日志
-                              '{error}', e.toString())); // 对应中文：分享失败
+                          EasyLoading.showToast(
+                              'operationFailedPleaseRetry'.tr); // 对应中文：操作失败，请重试
                         }
                       },
                     ),
@@ -210,9 +260,7 @@ class _ShareBottomSheetState extends State<ShareBottomSheet> {
                     // 4. 调用 _copy() 方法复制到剪贴板
                     // 数据格式：说话人 + 时间戳 + 内容
                     _shareItem(Icons.copy, 'copyTranscript'.tr, // 对应中文：复制转写
-                        onTap: _controller.meetingDetails.value.tasktype >= 3 &&
+                        onTap: _hasTranscriptPermission
-                                _controller.meetingDetails.value.tasktype <
-                                    10002
                             ? () {
                                 Get.back();
                                 _copy(_getAllText());
@@ -228,9 +276,7 @@ class _ShareBottomSheetState extends State<ShareBottomSheet> {
                     // 4. 调用 _copy() 方法复制到剪贴板
                     _shareItem(Icons.copy, 'copySummary'.tr, // 对应中文：复制总结
                         isBorder: false,
-                        onTap: _controller.meetingDetails.value.tasktype >= 5 &&
+                        onTap: _hasSummaryPermission
-                                _controller.meetingDetails.value.tasktype <
-                                    10001
                             ? () {
                                 Get.back();
                                 _copy(_markdownToPlainText(
@@ -267,16 +313,17 @@ class _ShareBottomSheetState extends State<ShareBottomSheet> {
                     // 6. 调用 _share() 方法分享文件
                     _shareItem(
                         Icons.message, 'exportTranscript'.tr, // 对应中文：导出转写
-                        onTap: _controller.meetingDetails.value.tasktype >= 3 &&
+                        onTap: _hasTranscriptPermission
-                                _controller.meetingDetails.value.tasktype <
-                                    10002
                             ? () async {
                                 Get.back();
                                 final tempDir = await getTemporaryDirectory();
+                                final safeTitle = _sanitizeFileName(
+                                    _controller.meetingData.value.title);
                                 final file = File(
-                                    '${tempDir.path}/${_controller.meetingData.value.title}_speaker.txt');
+                                    '${tempDir.path}/${safeTitle}_speaker.txt');
                                 String allText = _getAllText();
-                                await file.writeAsString(allText);
+                                await file.writeAsString(allText,
+                                    encoding: utf8);
                                 _share(file.path,
                                     'exportTranscript'.tr); // 对应中文：分享会议转写
                               }
@@ -292,9 +339,7 @@ class _ShareBottomSheetState extends State<ShareBottomSheet> {
                     //    - TXT: 创建临时文件，写入纯文本内容，调用 _share() 分享
                     //    - PDF: 调用 _exportMarkdownPdf() 方法生成PDF
                     _shareItem(Icons.article, 'exportSummary'.tr, // 对应中文：导出总结
-                        onTap: _controller.meetingDetails.value.tasktype >= 5 &&
+                        onTap: _hasSummaryPermission
-                                _controller.meetingDetails.value.tasktype <
-                                    10001
                             ? () async {
                                 Get.back();
                                 Get.bottomSheet(
@@ -308,11 +353,15 @@ class _ShareBottomSheetState extends State<ShareBottomSheet> {
                                         // 导出TXT格式
                                         final tempDir =
                                             await getTemporaryDirectory();
+                                        final safeTitle = _sanitizeFileName(
+                                            _controller
+                                                .meetingData.value.title);
                                         final file = File(
-                                            '${tempDir.path}/${_controller.meetingData.value.title}_summary.txt');
+                                            '${tempDir.path}/${safeTitle}_summary.txt');
                                         await file.writeAsString(
                                             _markdownToPlainText(_controller
-                                                .meetingDetails.value.summary));
+                                                .meetingDetails.value.summary),
+                                            encoding: utf8);
                                         _share(file.path,
                                             'exportSummary'.tr); // 对应中文：分享会议总结
                                       } else {
@@ -360,29 +409,8 @@ class _ShareBottomSheetState extends State<ShareBottomSheet> {
                     _shareItem(
                       Icons.save_alt,
                       'saveMindMap'.tr,
-                      onTap: _controller.meetingDetails.value.tasktype >= 5 &&
+                      onTap: _hasSummaryPermission
-                              _controller.meetingDetails.value.tasktype < 10001
+                          ? () => _handleMindMapAction(_MindMapActionType.save)
-                          ? () {
-                              Get.back();
-                              final mindMapController =
-                                  Get.find<MindMapController>();
-                              mindMapController.imageType = 1; // 1=保存到本地
-                              if (mindMapController.isWebViewReady) {
-                                mindMapController.webViewController
-                                    .runJavaScript('captureImage()');
-                              } else {
-                                mindMapController.webViewController
-                                    .setNavigationDelegate(
-                                  NavigationDelegate(
-                                    onPageFinished: (String url) {
-                                      mindMapController.isWebViewReady = true;
-                                      mindMapController.webViewController
-                                          .runJavaScript('captureImage()');
-                                    },
-                                  ),
-                                );
-                              }
-                            }
                           : null,
                     ),
                     // 【核心功能模块8：分享思维导图】
@@ -401,29 +429,8 @@ class _ShareBottomSheetState extends State<ShareBottomSheet> {
                       Icons.lan,
                       'shareMindMap'.tr, // 对应中文：分享思维导图
                       isBorder: false,
-                      onTap: _controller.meetingDetails.value.tasktype >= 5 &&
+                      onTap: _hasSummaryPermission
-                              _controller.meetingDetails.value.tasktype < 10001
+                          ? () => _handleMindMapAction(_MindMapActionType.share)
-                          ? () {
-                              Get.back();
-                              final mindMapController =
-                                  Get.find<MindMapController>();
-                              mindMapController.imageType = 2; // 2=分享
-                              if (mindMapController.isWebViewReady) {
-                                mindMapController.webViewController
-                                    .runJavaScript('captureImage()');
-                              } else {
-                                mindMapController.webViewController
-                                    .setNavigationDelegate(
-                                  NavigationDelegate(
-                                    onPageFinished: (String url) {
-                                      mindMapController.isWebViewReady = true;
-                                      mindMapController.webViewController
-                                          .runJavaScript('captureImage()');
-                                    },
-                                  ),
-                                );
-                              }
-                            }
                           : null,
                     ),
                   ]),
@@ -560,8 +567,8 @@ class _ShareBottomSheetState extends State<ShareBottomSheet> {
         EasyLoading.showToast('shareSuccess'.tr); // 对应中文：分享完成！
       }
     } catch (e) {
-      EasyLoading.showToast(
+      Logger.error('分享文件失败: $filepath', e); // 技术日志
-          'shareFailed'.tr.replaceAll('{error}', e.toString())); // 对应中文：分享失败
+      EasyLoading.showToast('operationFailedPleaseRetry'.tr); // 对应中文：操作失败，请重试
     }
   }
 
@@ -757,8 +764,8 @@ class _ShareBottomSheetState extends State<ShareBottomSheet> {
     EasyLoading.show(status: 'exportingPDF'.tr); // 对应中文：正在导出PDF...
     try {
       final tempDir = await getTemporaryDirectory();
-      final file = File(
+      final safeTitle = _sanitizeFileName(_controller.meetingData.value.title);
-          '${tempDir.path}/${_controller.meetingData.value.title}_summary.pdf');
+      final file = File('${tempDir.path}/${safeTitle}_summary.pdf');
       final List<pdf.Widget> markdownWidgets =
           await pdf.HTMLToPdf().convertMarkdown(
         _controller.meetingDetails.value.summary,
@@ -774,8 +781,8 @@ class _ShareBottomSheetState extends State<ShareBottomSheet> {
       await file.writeAsBytes(await markdownPdf.save());
       await _share(file.path, 'exportSummary'.tr); // 对应中文：分享会议总结
     } catch (e) {
-      EasyLoading.showToast(
+      Logger.error('导出PDF失败', e); // 技术日志
-          'shareFailed'.tr.replaceAll('{error}', e.toString())); // 对应中文：分享失败
+      EasyLoading.showToast('operationFailedPleaseRetry'.tr); // 对应中文：操作失败，请重试
     } finally {
       EasyLoading.dismiss();
     }