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/accounts/ui/AccountsPage/AccountsPage.tsx

@@ -12,7 +12,9 @@ const AccountsPage: FC = () => {
 	if (viewModel.state === "empty")
 		return (
 			<AccountsPageEmpty
+				lastSuccessfulAt={viewModel.lastSuccessfulAt}
 				refreshing={viewModel.refreshing}
+				sourceError={viewModel.sourceError}
 				refreshError={viewModel.refreshError}
 				retry={viewModel.retry}
 			/>
@@ -20,7 +22,9 @@ const AccountsPage: FC = () => {
 	return (
 		<AccountsPageLoaded
 			accounts={viewModel.accounts}
+			lastSuccessfulAt={viewModel.lastSuccessfulAt}
 			refreshing={viewModel.refreshing}
+			sourceError={viewModel.sourceError}
 			refreshError={viewModel.refreshError}
 			retry={viewModel.retry}
 		/>