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-events/ui/AccountEventsPage/components/AccountEventsPageLoaded.view.tsx

@@ -11,6 +11,7 @@ import { DatePickerInput } from "@mantine/dates";
 import type { FC } from "react";
 import { useTranslation } from "react-i18next";
 import { BrokerageEventCard } from "@/entities/brokerage-event";
+import { formatSnapshotTime } from "@/shared/lib";
 import type { AccountEventsPageViewModel } from "../AccountEventsPage.vm";
 import { AccountEventsPageEmpty } from "./AccountEventsPageEmpty.view";
 
@@ -23,13 +24,30 @@ const AccountEventsPageLoaded: FC<AccountEventsPageLoadedProps> = (props) => {
 	const { t } = useTranslation();
 	return (
 		<Stack gap="lg">
+			{props.lastSuccessfulAt ? (
+				<Text size="xs" c="dimmed">
+					{t("investment.sourceTime", {
+						date: formatSnapshotTime(props.lastSuccessfulAt),
+					})}
+				</Text>
+			) : null}
 			<Title order={1}>{t("events.title")}</Title>
+			<Button onClick={props.retry} disabled={props.refreshing} w="fit-content">
+				{t("investment.refresh")}
+			</Button>
+			{props.partial ? (
+				<Alert role="status">{t("investment.partial")}</Alert>
+			) : null}
 			{props.refreshing ? (
 				<Progress value={100} animated aria-label={t("accounts.refreshing")} />
 			) : null}
 			{props.refreshError ? (
-				<Alert color="yellow">
-					{t("accounts.refreshError")}
+				<Alert color="yellow" role="status" aria-live="polite">
+					{t(
+						props.sourceError
+							? "investment.syncFailed"
+							: "accounts.refreshError",
+					)}
 					<Button variant="subtle" onClick={props.retry}>
 						{t("accounts.retry")}
 					</Button>
@@ -80,9 +98,9 @@ const AccountEventsPageLoaded: FC<AccountEventsPageLoadedProps> = (props) => {
 						/>
 					))}
 				</Stack>
-			) : (
+			) : !props.partial ? (
 				<AccountEventsPageEmpty />
-			)}
+			) : null}
 		</Stack>
 	);
 };