fix: detect 401/403 auth errors from boxo pinning client

[pcfreak30]

Boxo returns HTTP errors as raw strings like 'remote pinning service
returned http error 401: ...' which were being wrapped as ErrPinningFailed,
producing unhelpful 'pinning failed' messages instead of clear auth errors.

Add isBoxoAuthError() with regex matching on boxo error messages and
use wrapPinningError/WrapAuthError consistently across Pin, List, UnpinAll,
UpdateMetadata, and waitForPinCompletion.

---

Detect and properly handle 401/403 authentication errors from the boxo pinning client

The boxo remote pinning client returns HTTP 401/403 errors as string-based error messages (e.g., "remote pinning service returned http error 401: unauthorized") rather than typed errors, causing them to be misidentified as generic pinning failures. This PR adds detection for these auth errors via regex matching on the error message, and ensures all pinning operations (Pin, List, Status, UpdateMetadata, waitForPinCompletion) properly surface them as authentication errors with a clear message directing users to re-authenticate.

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[github-actions]

Code Coverage Report

Total Coverage: 34.6%

Generated from commit: 6f5029f
Repository: LumeWeb/pinner-cli