Fix twitter cookie parsing regression

[srxly888-creator]

What Changed / 更新内容

• Refactored Cookie Parsing / 重构 Cookie 解析: Extracted the Twitter/X cookie parsing logic into a dedicated helper module for better maintainability.
  （将 Twitter/X 的 cookie 解析逻辑提取到了专用的辅助模块中，以提升代码的可维护性。）
• Preserved Core Logic / 保留核心逻辑: Kept the existing configuration write behavior and the ~/.config/xfetch/session.json synchronization completely unchanged.
  （现有的配置写入行为，以及与 ~/.config/xfetch/session.json 的同步逻辑保持完全不变。）
• Enhanced Test Coverage / 完善测试覆盖: Added comprehensive unit tests covering both supported input formats.
  （新增了全面的单元测试，已覆盖两种受支持的输入格式。）

Testing / 测试情况

Command Run / 执行命令:

PYTHONPATH=/Volumes/PS1008/Github/Agent-Reach pytest -q /Volumes/PS1008/Github/Agent-Reach/tests/test_cli.py

[Panniantong]

Thanks for the contribution! 🙏

I've rebased your changes onto the latest main (which now includes the bird migration from PR #193). All tests pass (10/10).

Since this is a fork PR and can't be rebased in-place, I've opened a new PR based on the rebased branch: see PR #196. Credit preserved in the commit.

Closing this in favor of the rebased version.