Refactor auth for better readability

**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.

No files, tests, or entry points are named. Start by locating the authentication and component error-handling code, then review existing error messages and related tests. Done means the error-handling structure is easier to read and component failures produce more descriptive messages, with tests covering the revised behavior.

Written by the indexing model from the issue text.