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**Category:** new-feature **User Impact:** People who lose a desktop identity can securely restore it from a signed-in Buzz phone without creating a replacement identity. **Problem:** A fresh or identity-lost desktop could not recover its existing full Buzz identity from an already-authorized phone. **Solution:** Add a SAS-confirmed reverse NIP-AB transfer, durable desktop import, a dedicated mobile recovery entry point, and clearer desktop recovery dialogs with tested loading, drag-and-drop, and failure states. https://github.com/user-attachments/assets/e9215c9c-80d0-462f-9161-0fa184ca2f74 <details> <summary>File changes</summary> **crates/buzz-core/src/pairing/session.rs** Adds the reverse encrypted payload and source-completion state transitions used for phone-to-desktop recovery. **desktop/src-tauri/src/commands/identity.rs** Exposes the existing guarded identity commit path for recovery imports. **desktop/src-tauri/src/commands/pairing.rs** Adds recovery-mode pairing, durable nsec import, start serialization, stale-task protection, and explicit rejection of unsupported recovery payloads. **desktop/src-tauri/src/lib.rs** Registers the recovery pairing command. **desktop/src/app/App.tsx** Refreshes the recovered identity before continuing onboarding. **desktop/src/features/onboarding/machineOnboarding.ts** Adds recovery transitions to the onboarding state machine. **desktop/src/features/onboarding/ui/BackupPasswordTimeline.tsx** Adds the visual backup-to-password-to-unlock progression. **desktop/src/features/onboarding/ui/IdentityRecoveryPairing.tsx** Implements QR generation, copy fallback, SAS confirmation, cancellation, expiry, and completion UI. **desktop/src/features/onboarding/ui/MachineOnboardingFlow.tsx** Connects private-key, phone, and backup recovery paths to the onboarding flow. **desktop/src/features/onboarding/ui/NostrKeyImportForm.tsx** Polishes recovery dialogs, backup drag-and-drop, loading stability, and security copy. **desktop/src/shared/api/tauri.ts** Keeps the existing pairing API surface focused on standard desktop-to-mobile pairing. **desktop/src/shared/api/tauriPairing.ts** Adds the recovery pairing invoke without growing the ratcheted shared API file. **desktop/src/testing/e2eBridge.ts** Mocks recovery pairing commands and lifecycle events for browser tests. **desktop/tests/e2e/identity-lost.spec.ts** Covers lost-identity entry, QR/copy recovery, SAS, cancellation, expiry, success, errors, backup import, drag-and-drop, and screenshots. **desktop/tests/e2e/onboarding.spec.ts** Verifies recovered identities continue through harness setup without replacement-key side effects. **mobile/lib/features/pairing/pairing_page.dart** Adds recovery-only scanning and explicit identity-handoff warnings. **mobile/lib/features/pairing/pairing_provider.dart** Recognizes recovery codes, returns the signed-in nsec after mutual SAS approval, and waits for desktop completion. **mobile/lib/features/settings/settings_page.dart** Accepts the recovery route builder at the app composition boundary to preserve feature isolation. **mobile/lib/features/settings/settings_page/connection_section.dart** Adds the signed-in “Send identity to desktop” settings action. **mobile/test/features/pairing/pairing_page_test.dart** Covers recovery-only validation and handoff messaging. **mobile/test/features/pairing/pairing_provider_test.dart** Covers reverse payload encryption, confirmation ordering, success, failure, timeout, and cleanup. </details> ## Reproduction steps 1. Launch Buzz Desktop with identity-lost state and choose **Recover from your phone**. 2. Confirm the QR and persistent **Copy pairing code** fallback appear without layout shift. 3. On a signed-in phone, open **Settings → Send identity to desktop**, scan or paste the recovery code, and compare the six-digit SAS on both devices. 4. Confirm on both sides and verify Desktop restores the identity and continues to harness setup. 5. Repeat from identity-lost state with **Recover from a backup file**; verify picker and drag-and-drop both advance to password entry and restore the encrypted backup. 6. Exercise cancellation, mismatched/unsupported codes, expired sessions, and an invalid backup; verify each returns actionable, non-stuck UI. ## Screenshots ### Desktop phone recovery — complete flow | Recovery entry | Pairing QR | Code match | Receiving identity | |---|---|---|---| |  |  |  |  | ### iOS Simulator — complete handoff flow | Settings entry | Recovery scanner | Manual recovery code | Code confirmation | |---|---|---|---| |  |  |  |  | ### Encrypted backup recovery — adjusted file flow | File picker | Drag-and-drop target | Password step | |---|---|---| |  |  |  | ## Verification - `cargo test -p buzz-core pairing` — 71 passed - `just mobile-test` — 1,169 passed - `pnpm build:e2e && pnpm exec playwright test identity-lost.spec.ts --project=smoke` — 15 passed - Full pre-push gates — desktop checks, desktop unit tests, Rust tests, Tauri checks, and mobile tests passed --------- Signed-off-by: Taylor Ho <taylorkmho@gmail.com> Co-authored-by: npub1223z34hd7vtwc6qj4s7flsxkj644nlre2nthu7lrrmkumhu3xddsrx9r6w <52a228d6edf316ec6812ac3c9fc0d696ab59fc7954d77e7be31eedcddf91335b@buzz.block.builderlab.xyz> Co-authored-by: Carl <acda9e433d19dcd0e6b6840f7f4b98f3a56f1fab98049d444c087019e6d36560@buzz.block.builderlab.xyz>
