enableCloudBackup

Enable cross-device Dust cloud sync: obtain the Drive drive.appdata grant, then run a full sync. This is bidirectional — once consent exists, wallet.refresh() first restores from the cloud checkpoint if this device has none (so a fresh device deltas instead of replaying genesis), then uploads the latest checkpoint. If consent is already granted it runs silently; otherwise it emits an IntentSenderRequest via consentRequests for the panel to launch — the result returns through onConsentResult.