Improve error messages in auth

**Problem**
When working with components, the error messages could be more descriptive.

**Suggestion**
Improve error handling and add detailed error messages.

**Context**
This would help with debugging and maintenance.

Start by locating the authentication error-handling paths used by components in this Shell project. Review the existing errors and determine which context is missing from their messages. Done means component authentication failures provide consistently more descriptive messages and the affected scenarios can be verified.

Written by the indexing model from the issue text.