b89a7e2617
Renames DecryptParams.ownDeviceId to ownUserId so decryptMessages actually looks up bundles by user. Sweeps remaining OwnDeviceCtx and loadDevicePrivateKey consumers in the desktop app to use cachedUserKey from userIdentity. Files scheduled for deletion in later tasks (BackupExportDialog, DeviceRestore, BackupRestoreDialog, BackupPromptBanner, deviceBackup, DeviceRegistration) are left untouched.