feat: show persisted investment data and sync state

Consume the provided resource-envelope API snapshot. Preserve financial snapshots during
refresh, observe synchronization without importing, and fence late responses across
account and connection changes.

src/pages/account/ui/AccountPage/components/AccountPageEmpty.view.tsx

@@ -19,6 +19,7 @@ type AccountPageEmptyProps = {
 	account?: BrokerageAccount;
 	accountId?: string;
 	refreshing?: boolean;
+	sourceError?: boolean;
 	refreshError?: boolean;
 	retry?: () => void;
 	recentOperations: AccountPageRecentOperations;
@@ -33,6 +34,7 @@ const AccountPageEmpty: FC<AccountPageEmptyProps> = (props) => {
 			<AccountHeading account={props.account} accountId={props.accountId} />
 			<PortfolioRefreshState
 				refreshing={props.refreshing ?? false}
+				sourceError={props.sourceError}
 				refreshError={props.refreshError ?? false}
 				retry={props.retry}
 			/>