fix: ouath2proxy logout fix

[piekarski-mateusz]

Closes #5524

📑 Description

When using OAUTH2PROXY authentication (oauth2-proxy + FusionAuth), clicking "Sign Out" in the UI would immediately log the user back in. This happened because:

1. NextAuth's signOut() only clears the local session cookie
2. The oauth2-proxy session cookie remains active
3. The FusionAuth session remains active

Since oauth2-proxy still has a valid session, it automatically re-authenticates the user on the next request.

• shared/lib/hooks/useSignOut.ts - Check for OAUTH2PROXY auth type and redirect to /oauth2/sign_out
• shared/api/ApiClient.ts - Same handling for automatic sign-out on 401 responses
• Added unit tests for useSignOut hook (8 tests)
• Added unit tests for ApiClient (6 tests)

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

ℹ Additional Information

[vercel]

@piekarski-mateusz is attempting to deploy a commit to the KeepHQ Team on Vercel.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 30.54%. Comparing base (97c263a) to head (7e8f826).
⚠️ Report is 17 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5522       +/-   ##
===========================================
- Coverage   46.39%   30.54%   -15.86%     
===========================================
  Files         176      101       -75     
  Lines       18412    11669     -6743     
===========================================
- Hits         8543     3564     -4979     
+ Misses       9869     8105     -1764     

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[shahargl]

lgtm

[vercel]

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Project	Deployment	Review	Updated (UTC)
keep	Ready	Preview, Comment	Jan 27, 2026 8:33am