feat: 新增工作台模式、系统托盘，修复多平台兼容性问题

1. 新增工作台三栏布局模式，适配宽屏设备
2. 添加跨平台系统托盘支持，新增托盘图标资源
3. 修复工作台模式下导航返回异常问题
4. 统一JSON类型安全解析，替换硬类型转换
5. 增加macOS深度链接支持，统一渠道分发信息
6. 优化部分页面生命周期和状态加载逻辑
7. 移除废弃的nearby_connections依赖

lib/features/correction/correction_provider.dart

@@ -1,13 +1,14 @@
 /// ============================================================
 /// 闲言APP — 纠错状态管理
 /// 创建时间: 2026-04-28
-/// 更新时间: 2026-06-17
+/// 更新时间: 2026-06-19
 /// 作用: 纠错提交功能状态管理 + 纠错历史本地缓存（drift）
-/// 上次更新: 接入 drift 本地缓存，支持离线查看纠错历史
+/// 上次更新: 修复JSON类型安全问题，使用SafeJson.parseInt替代as int? ?? 0
 /// ============================================================
 
 import 'package:drift/drift.dart' show Value;
 import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:xianyan/core/utils/safe_json.dart';
 
 import '../../../core/network/api_client.dart';
 import '../../../core/storage/database/app_database.dart';
@@ -97,7 +98,7 @@ class CorrectionItem {
       sourceId: sourceId,
       switchVal: switchVal,
       isLocal: isLocal,
-      createtime: map['createtime'] as int? ?? 0,
+      createtime: SafeJson.parseInt(map['createtime']),
       content: map['content'] as String? ?? '',
       username: map['username'] as String? ?? '',
       email: map['mail'] as String? ?? '',
@@ -263,7 +264,7 @@ class CorrectionNotifier extends Notifier<CorrectionState> {
         data: submitData,
       );
       final respData = response.data as Map<String, dynamic>;
-      final code = respData['code'] as int? ?? 0;
+      final code = SafeJson.parseInt(respData['code']);
       if (code == 1) {
         // 提交成功，写入本地缓存
         final nowSec = DateTime.now().millisecondsSinceEpoch ~/ 1000;
@@ -332,13 +333,13 @@ class CorrectionNotifier extends Notifier<CorrectionState> {
         queryParameters: {'page': page, 'limit': limit},
       );
       final data = response.data as Map<String, dynamic>;
-      final code = data['code'] as int? ?? 0;
+      final code = SafeJson.parseInt(data['code']);
       if (code == 1) {
         final result = data['data'] as Map<String, dynamic>? ?? {};
         final list = (result['list'] as List<dynamic>? ?? [])
             .map((e) => CorrectionItem.fromServerMap(e as Map<String, dynamic>))
             .toList();
-        final total = result['total'] as int? ?? 0;
+        final total = SafeJson.parseInt(result['total']);
 
         // 3. 全量替换本地缓存
         await _db.replaceCorrectionRecords(