Handle ApiError without axios response

[miachillgood]

Summary

• handle Axios errors that do not include a response object without throwing a secondary error
• fall back to status code 0, empty headers, and the original error message body for network/auth setup failures
• add ApiError regression coverage for missing-response errors and normal response-backed errors

Fixes #765.

Tests

• npm test -- --runInBand
• npm run build