[Bug] Connect account does not work

提交前确认 · Pre-submission checklist

• 我已搜索过现有 issue，确认这不是重复 / I searched existing issues and confirmed this isn't a duplicate.
• 我已阅读 CONTRIBUTING.md / I've read CONTRIBUTING.md.

问题类别 · Category

账号 / 登录 · Account / Login

涉及的 Agent 框架 · Agent framework

ZCode Agent（自研）

严重程度 · Severity

阻塞使用 · Blocking (无法使用核心功能 / core function unusable)

复现频率 · Reproducibility

必现 · Always

问题描述 · Description

I am using ZCode App on Linux. Upgraded to latest version 3.12.3. The 'Connect' feature does not work.

I am using a Team Plan.

Personal Plan is not subscribed.

Using API key is a workaround.

复现步骤 · Steps to reproduce

1. Open ZCode
2. Press 'Connect'
3. Authenticate in browser - Success
4. ZCode App shows "Login failed, please try again"

期望表现 · Expected behavior

Connect should work.

实际表现 · Actual behavior

Login failed, please try again

ZCode 版本 · ZCode version

3.12.3

设备 / 系统 / 浏览器 · Device / OS / Browser

Linux / Firefox

截图 / 录屏 / 日志 · Screenshots / Recordings / Logs

No response

Start by reproducing the Connect flow in ZCode 3.12.3 on Linux with Firefox: launch Connect, complete browser authentication, and observe the app's login-failed result. Trace the account/login flow from the Connect entry point and compare the successful browser step with the app response. Done means Team Plan users can complete Connect without the login-failed message; API-key use should remain unnecessary.