fix: redact invalid JWT cookie log

[tnware]

Summary

• Redacts the raw UniFi OS TOKEN cookie value from the invalid-JWT warning path
• Keeps the warning signal so malformed cookies remain diagnosable without leaking token material
• Adds a regression test that captures logs and asserts the invalid token value is absent

Test Plan

• python -m pytest tests/test_csrf_token.py::test_invalid_jwt_structure_warning_does_not_log_token_value -q — failed before implementation because the token value appeared in logs
• ruff check . — pass
• python -m pytest -q — pass
• python -m build — pass
• twine check dist/* — pass
• sphinx-build -E -W -b html docs docs/_build/html — pass
• git diff --check — pass

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: e001bce5-9062-4f8a-8485-94b87fde1a67

📥 Commits

Reviewing files that changed from the base of the PR and between 0446e67 and 1d17608.

📒 Files selected for processing (2)

• tests/test_csrf_token.py
• unifi_controller_api/api_client.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/redact-invalid-jwt-cookie-log

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