[BUG] Account switcher shows new account, but Code sessions still authenticate old account

### Preflight Checklist

- [x] I have searched [existing issues](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug) and this hasn't been reported yet
- [x] This is a single bug report (please file separate reports for different bugs)
- [x] I am using the latest version of Claude Code

### What's Wrong?

I currently have 2 Claude accounts:
1. sdenjoymfg@gmail.com
2. sarah@shopenjoymfg.com
I am logged into sarah@shopenjoymfg.com on the account switcher in the bottom left hand corner and trying to pull in my projects from sdenjoymfg.com for my new team account. my code sessions are still authenticating my old account sdenjoymfg@gmail.com

### What Should Happen?

I need to be logged into sarah@shopenjoymfg.com for both and be able to pull in the projects and session history from sdenjoymfg.com that is stored on my computer locally

### Error Messages/Logs

```shell

```

### Steps to Reproduce

I went through exact steps before

### Claude Model

None

### Is this a regression?

Yes, this worked in a previous version

### Last Working Version

_No response_

### Claude Code Version

1.49585.0

### Platform

Anthropic API

### Operating System

macOS

### Terminal/Shell

Terminal.app (macOS)

### Additional Information

_No response_

Start by reproducing the account-switching flow on macOS with Claude Code 1.49585.0, checking whether Code sessions authenticate the selected account or the previous one. Done means switching to sarah@shopenjoymfg.com authenticates both the account switcher and Code sessions while preserving access to the locally stored projects and session history.

Written by the indexing model from the issue text.