登录账号一个小问题，不知道是不是我的个人操作问题！🐛[BUG]

### 🐛 描述(Description)

### 📷 复现步骤(Steps to Reproduce)

1. 点击第一个账号登录是正确的
2. 切换下一个账号登录是第一个账号的，错误了！
3. 然后添加新的账号还登录新的账号，错误了！！！！

### 📄 [异常/日志]信息([Exception/Log] Information)

### 🚑 基本信息(Basic Information)

- 程序版本(Program Version):2.6.4 for Windows (x64)
- 系统版本号(OS Version): Windows 11 22000.434
- 是否为应用商店版本(Whether it is a Store version): 否

### 🖼 截图(Screenshots)

Start by reproducing the account-switching flow in SteamTools 2.6.4 on Windows 11: log into the first account, switch to another, and try adding a new account. Check whether the wrong account is selected in both cases, and use the result to define the fix; the issue provides no file or test entry point.

Written by the indexing model from the issue text.