chrome中已经登录，但获取不到cookie

### Version

xhs, version 0.6.4

### Operating System

Windows

### What happened?

PS C:\Users\Administrator> xhs login --cookie-source chrome
✗ Login verification failed: No 'a1' cookie found for xiaohongshu.com in chrome.

Troubleshooting:
1. Open a browser and visit https://www.xiaohongshu.com/
2. Make sure you are logged in
3. Try: xhs login --cookie-source

### Expected behavior

能获取到cookie才对

### Steps to reproduce

```bash

```

### Error output / logs

```text

```

Start by reproducing `xhs login --cookie-source chrome` on Windows with Chrome logged in to xiaohongshu.com, then trace the Chrome cookie-source handling and its search for the `a1` cookie. Done means the command detects the existing cookie and completes login verification without the reported error.

Written by the indexing model from the issue text.