fix: reauthenticate rejected OAuth sessions

[ygpark80]

User description

Problem

A registered Anthropic OAuth token rejected with HTTP 401 was reported as incomplete without starting the account's renewal flow.

Change

Classify HTTP 401 authentication failures as reauthentication candidates and cover the case with a regression test.

Validation

• go test ./...
• go test -race ./...
• go vet ./...
• Linux amd64 and macOS arm64 builds

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CodeAnt-AI Description

Reauthenticate OAuth accounts when any request returns HTTP 401

What Changed

• HTTP 401 responses now trigger the account reauthentication flow, including rejected OAuth tokens returned while reading account settings
• Transient failures continue without prompting for reauthentication
• Added regression coverage for rejected OAuth token responses

Impact

✅ Fewer incomplete OAuth sessions
✅ Automatic recovery from rejected OAuth tokens
✅ Clear separation between authentication failures and temporary outages

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🤖 CodeAnt AI — Review Status

Status	Commit	Started (UTC)	Finished (UTC)
✅ Reviewed your PR	f14d468	Sep 10, 2026 · 07:56	07:58

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