Android TV shows "Signed in!" when saving the device sign-in failed

[Quick104]

After a phone approves the Android TV's sign-in code, the TV can show "Signed in!" even though saving the session failed. It stays on that screen with no error and no way to retry from the QR card.

Why

• TvLoginViewModel.handleDeviceLoginApproved saves the approved session. When that fails (AccountSessionChangedException, a generation mismatch afterwards, or a storage error that left the tokens uncommitted), it sets uiState.error and leaves loginSuccess false (TvLoginViewModel.kt).
• The QR card only receives the device sign-in state, not uiState.error. It renders the repository's Approved state as "Signed in!" (TvLoginScreen.kt).
• uiState.error is only drawn inside the password form (TvLoginScreen.kt), so the user never sees it unless they open that form.

Expected

The QR card shows that the TV couldn't finish signing in, with "Try again". The server has already issued and consumed this request's tokens, so "Try again" needs a new code.

Notes

• Validation: touches TV client sign-in & onboarding — Android TV #337 C1. It hasn't been run yet.

AI disclosure

• Harness: T3 Code (Claude Code agent harness)
• Tool(s): Claude Code, GitHub CLI
• Model(s): claude-opus-5-5
• Involvement: AI-drafted at the maintainer's request, from reading the code on main at c38fb93; not reproduced on a device
• Adversarial review: n/a