refactor(时间格式化): 使用Duration重构时间格式化方法并确保秒数非负

修改了两个视图中的_formatHms方法，使用Duration类进行时间计算，同时添加了对负数的处理，确保时间显示始终有效

lib/modules/meeting/views/meeting_home_view.dart

@@ -513,9 +513,11 @@ class _MeetingHomeViewState extends State<MeetingHomeView>
   }
 
   String _formatHms(int seconds) {
-    int h = seconds ~/ 3600;
-    int m = (seconds % 3600) ~/ 60;
-    int s = seconds % 60;
+    final sec = seconds < 0 ? 0 : seconds; // 确保秒数非负
+    final d = Duration(seconds: sec);
+    final h = d.inHours;
+    final m = d.inMinutes.remainder(60);
+    final s = d.inSeconds.remainder(60);
     String twoDigits(int n) => n.toString().padLeft(2, '0');
     return '${twoDigits(h)}:${twoDigits(m)}:${twoDigits(s)}';
   }

lib/modules/translation/middleware/views/translation_middleware_view.dart

@@ -212,9 +212,11 @@ class TranslationMiddlewareView
   }
 
   String _formatHms(int seconds) {
-    int h = seconds ~/ 3600;
-    int m = (seconds % 3600) ~/ 60;
-    int s = seconds % 60;
+    final sec = seconds < 0 ? 0 : seconds; // 确保秒数非负
+    final d = Duration(seconds: sec);
+    final h = d.inHours;
+    final m = d.inMinutes.remainder(60);
+    final s = d.inSeconds.remainder(60);
     String twoDigits(int n) => n.toString().padLeft(2, '0');
     return '${twoDigits(h)}:${twoDigits(m)}:${twoDigits(s)}';
   }