Purpose

Implement authentication without leaking SDK details or weakening authorization.

When to use

• Adding login, signup or logout.
• Handling auth state in ViewModel/UI.
• Linking user profile data.
• Mapping Firebase Auth errors safely.

Inputs to inspect

• Required providers and UX flow.
• Auth state handling.
• User profile model.
• Firestore/Storage rules that depend on auth.

Required workflow