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What This PR Does
This PR refactors the internal login service logic, specifically the runProtected() and _retrieveUserInfo() methods, with the goal of:
Improving code readability and maintainability
Simplifying control flow
Making log messages more actionable and less ambiguous
Handling broken or missing credentials more gracefully
❓ Why I'm creating this PR

While trying to authenticate using dart pub login, I encountered this issue:
you are logged in as null
This indicated broken or malformed credentials, and the current logging flow was not clear or helpful enough.