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Fixed

Request Details column preferences: In Usage → Request Details, deliberately hiding the Key column now persists across tab changes, navigation away and back, and app restarts. Valid saved selections are no longer reset to defaults; new installations retain the 10 default columns.
ZCode provider configuration: Remove stale and duplicate model entries while preserving saved selections and ordering. Invalid context/output limits and empty or duplicate reasoning levels no longer cause custom providers to disappear.
Codex sign-in switching: Switching between API-key and OAuth sign-in preserves the selected profile's settings. Closing managed configuration restores the original profile and credential-storage preference.

请求明细列偏好：在「用量 → 请求明细」中主动隐藏 Key 列后，切换标签页、离开页面再返回或重启应用都会保留该选择。有效的已保存选择不再被重置为默认值，新安装仍默认显示 10 列。
ZCode 提供商配置：清理失效及重复的模型条目，同时保留已保存的选择和排序，避免无效的上下文或输出限制、空白或重复的推理级别导致自定义提供商消失。
Codex 登录方式切换：切换 API Key 与 OAuth 登录时保留所选配置档案的设置；关闭托管配置后恢复原有配置档案及凭据存储偏好。