Sign out of Firebase and clear API and local profile if the GraphQL exchange or token save fails after Firebase Google sign-in, so the user is not left in a half-authenticated state. Rename the exchange helper to exchangeFirebaseIdTokenWithBackend for clarity.
Login: ignore duplicate Google taps while loading and disable the Google button during the flow. Credential Manager: treat GetCredentialInterruptedException as cancellation and rethrow CancellationException so coroutines cancel correctly.
Tests: assert signOut is invoked when the backend exchange fails.
Made-with: Cursor
beetzung
ac334db940