[Bug] Continually failing to restore sessions

The app has been failing to restore any of my sessions for the last few days. I just updated to 1.1.11 but it doesn't seem to have helped. This includes sessions that were started 2h ago through sessions 20d old, and sessions that are with and without nested sessions. I'm happy to help debug if that's helpful!

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| Field | Value |
| --- | --- |
| App version | 1.1.11 |
| OS | macOS 26.6.2 |
| Theme | Rainglow Lavender |
| Path | /chat |
| Tenure | Week 4 |

从 /chat 路径开始，在 macOS 26.6.2 上使用应用版本 1.1.11，分别通过最近的会话和较早的会话重现该故障，包括有嵌套会话和没有嵌套会话的会话。比较恢复行为和可用的调试信息；所有列出的会话类型都能成功恢复即表示完成。

由索引模型根据 Issue 内容生成。