Audible: Fix authentication for new API token format (#2875)

Audible: Fix authentication for new API token format (#2875)

* Fix Audible authentication for new API token format

- Add compatible token refresh handling for new actor_access_token format
- Validate signing auth availability (preferred, stable auth method)
- Accept multiple authorization code parameter names in callback URL
- Improve error handling and diagnostic messages

* Use shared http_session instead of creating new client

- Modify refresh_access_token_compat to accept http_session parameter
- Update to use aiohttp ClientSession (from mass.http_session)
- Remove unnecessary httpx.AsyncClient creation

---------

Co-authored-by: Ztripez von Matérn <ztripez@bobby.se>