Add new sync screen for showing recovery code

[CDRussell]

Task/Issue URL: https://app.asana.com/1/137249556945/project/488551667048375/task/1213299640229975?focus=true

Description

Adds a new "Recover Your Data Easily" screen as an alternative to the existing recovery code screen during sync setup. The new screen includes a "Restore on App Reinstall" toggle that, when enabled, persists the recovery code and device ID to Block Store when the user taps Next or Back.

• Gated by recoverDataEasilySetupScreen (INTERNAL — enabled for internal builds by default)
• The toggle is shown only when syncAutoRestore is enabled and Block Store is available on the device
• Toggle preference is persisted to DataStore so it is remembered if the screen is revisited (which will be needed in follow up PR)
• On Next or Back: if toggle is ON, saves recovery code + device ID to Block Store; if OFF, clears any existing payload

Steps to test this PR

Notes

• Prerequisites: Internal build installed on a device with Google Play Services, logged into a Google account.
• Navigate to Settings > Sync Dev Settings to access Block Store controls and to launch the new screen directly.
• ℹ️ Clearing app data does not restore Block Store data; it must be an uninstall/reinstall.
• Suggested logcat filter: Sync-Recovery|Sync-AutoRestore

Scenario 1: recoverDataEasilySetupScreen OFF — old screen shown, no regression

• Disable recoverDataEasilySetupScreen FF by hardcoding it to FALSE
• Fresh install internalDebug
• Set up Sync via Sync & Backup → Sync & Back Up This Device
• Verify the old recovery code screen is shown (title: "Save Recovery Code")
• Tap Next — verify sync setup continues normally

Scenario 2: recoverDataEasilySetupScreen ON, syncAutoRestore OFF — new screen shown, no toggle

• Discard local changes, to return recoverDataEasilySetupScreen to INTERNAL
• Fresh install
• Set up Sync via Sync & Backup → Sync & Back Up This Device
• Verify the new "Recover Your Data Easily" screen is shown
• Verify the "Restore on App Reinstall" toggle is not visible
• Tap Next — verify sync setup continues normally
• Go to Sync Dev Settings → verify Block Store is empty (nothing was written)

Scenario 3: recoverDataEasilySetupScreen ON, syncAutoRestore ON — toggle ON, payload saved on Next

• Set both recoverDataEasilySetupScreen and syncAutoRestore to INTERNAL
• Fresh install
• Set up Sync via Sync & Backup → Sync & Back Up This Device
• Verify the new "Recover Your Data Easily" screen is shown with the toggle visible and ON by default
• Tap Next
• Go to Sync Dev Settings → verify Block Store shows a JSON payload containing both recovery_code and device_id

Scenario 4: recoverDataEasilySetupScreen ON, syncAutoRestore ON — toggle turned OFF, payload cleared

• Clear app data and restart (clear data this time as you want a fresh slate)
• Set up Sync. On the new screen, toggle "Restore on App Reinstall" to OFF
• Tap Next
• Go to Sync Dev Settings → verify Block Store is empty (payload was cleared)

---

Note

Medium Risk
Introduces a new sync setup screen and new persistence paths (DataStore + Block Store writes/clears) that affect account recovery behavior and device state. Risk is mitigated by feature-flag gating (recoverDataEasilySetupScreen) and additional unit test coverage, but flow/regression risk remains in setup navigation and storage availability checks.

Overview
Adds an alternative “Recover Your Data Easily” recovery-code step during sync setup (new RecoverDataFragment/RecoverDataViewModel + layout/drawables/strings), selected via a new recoverDataEasilySetupScreen feature toggle.

Extends auto-restore support by detecting Block Store availability (isAutoRestoreAvailable) and introducing a persisted Restore on App Reinstall user preference via a new DataStore (SyncAutoRestorePreferenceDataStore + DI wiring). When the toggle is enabled/disabled, the flow now writes or clears the recovery payload (recovery code + device id) in persistent storage on Next/Back.

Updates internal sync dev settings to refresh Block Store values on resume, add a one-tap “store current recovery code” action, and provide a shortcut to launch the new recovery screen; adds/updates unit tests around the new availability gating and setup-screen selection.

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[CDRussell]

• Update sync settings screen with new recovery section #8008
• Add new sync screen for showing recovery code #7966 👈 (View in Graphite)
• Prevent orphaned sync devices when auto-restoring #7969
• Headless sync recovery implementation #7941
• Sync auto recovery detection in onboarding #7925
• Add SyncAutoRestore API and SyncRecovery key #7910
• develop

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