Fix: Clear auth state when switching from multiuser to single-user mode

[Copilot]

Summary

When switching InvokeAI from multiuser → single-user mode, a JWT token persisted in localStorage kept the Redux auth state as "authenticated", causing the user icon to remain visible without requiring a manual logout.

Changes in ProtectedRoute.tsx:

• Auto-logout on mode switch: When multiuser_enabled is false but isAuthenticated is true, dispatch logout() to clear both the localStorage token and Redux auth state — the user icon disappears automatically on page load in single-user mode.
• Skip user fetch in single-user mode: Added multiuserEnabled guard to shouldFetchUser to prevent a race where useGetCurrentUserQuery could populate user state before the logout effect ran.

Related Issues / Discussions

QA Instructions

1. Start InvokeAI in multiuser mode (multiuser: true in invokeai.yaml), navigate to the app, and log in.
2. Stop the server, set multiuser: false, restart.
3. Reload the page — the user icon should no longer appear without needing to manually log out.

Merge Plan

Checklist

• The PR has a short but descriptive title, suitable for a changelog
• Tests added / updated (if applicable)
• ❗Changes to a redux slice have a corresponding migration
• Documentation added / updated (if applicable)
• Updated What's New copy (if doing a release after this PR)

Original prompt

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This section details on the original issue you should resolve

<issue_title>[bug]: Login persists when invoke is moved from multiuser mode to singleuser mode</issue_title>
<issue_description>### Is there an existing issue for this problem?

• I have searched the existing issues

Install method

Invoke's Launcher

Operating system

Linux

GPU vendor

Nvidia (CUDA)

GPU model

No response

GPU VRAM

No response

Version number

feature/multiuser

Browser

No response

System Information

No response

What happened

I was running InvokeAI in multiuser mode and logged in as a user. I then killed the server, switched from multiuser to singleuser mode (by setting multiuser: false in invokeai.yaml) and then reloaded the page. I saw that the user icon was still present and showed myself logged in as a user. When I clicked the "logout" button, the user icon disappeared and all was as expected for single user mode.

What you expected to happen

When invokeai is put into single-user mode, I expect the user icon to disappear without my having to log out.

How to reproduce the problem

No response

Additional context

No response

Discord username

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [bug]: Login persists when invoke is moved from multiuser mode to singleuser mode #85

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[lstein]

Works as advertised.