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/features/instrument-details/ui/InstrumentSection.view.tsx

@@ -11,6 +11,7 @@ import {
 import { LoadingSkeleton } from "@wealthledger/ui";
 import type { FC, PropsWithChildren, ReactNode } from "react";
 import { useTranslation } from "react-i18next";
+import { formatSnapshotTime } from "@/shared/lib";
 import type { SectionState } from "../model/section";
 import classes from "./InstrumentDetails.module.css";
 
@@ -38,20 +39,40 @@ const InstrumentSection: FC<InstrumentSectionProps> = (props) => {
 				</Title>
 				{props.controls}
 			</Group>
+			{props.state.stale ? (
+				<Text size="xs">{t("investment.stale")}</Text>
+			) : null}
+			{props.state.partial ? (
+				<Text role="status">{t("investment.partial")}</Text>
+			) : null}
+			{props.state.lastSuccessfulAt ? (
+				<Text size="xs" c="dimmed">
+					{t("investment.sourceTime", {
+						date: formatSnapshotTime(props.state.lastSuccessfulAt),
+					})}
+				</Text>
+			) : null}
 			{props.state.refreshing ? (
 				<Text role="status" size="xs" c="dimmed">
 					{t("accounts.refreshing")}
 				</Text>
 			) : null}
 			{props.state.error ? (
-				<Alert color="orange" mb="sm" role="alert">
+				<Alert color="orange" mb="sm" role="status" aria-live="polite">
 					<Group justify="space-between">
 						<Text size="sm">
-							{props.state.hasData
-								? t("accounts.refreshError")
-								: t("stock.sectionError")}
+							{props.state.sourceError
+								? t("investment.syncFailed")
+								: props.state.hasData
+									? t("accounts.refreshError")
+									: t("stock.sectionError")}
 						</Text>
-						<Button size="xs" variant="default" onClick={props.state.retry}>
+						<Button
+							size="xs"
+							variant="default"
+							onClick={props.state.retry}
+							disabled={props.state.refreshing}
+						>
 							{t("accounts.retry")}
 						</Button>
 					</Group>