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/model/section.test.ts

@@ -0,0 +1,59 @@
+import { describe, expect, it, vi } from "vitest";
+import { resource } from "@/test/resource";
+import { section } from "./section";
+
+describe("instrument source and transport presentation", () => {
+	it.each(["missing", "partial", "complete"] as const)(
+		"keeps %s separate from successful transport",
+		(availability) => {
+			const data = availability === "missing" ? undefined : { rows: [] };
+			const state = section({
+				data,
+				meta: resource(data, { availability }).meta,
+				isError: false,
+				isFetching: false,
+				refetch: vi.fn(),
+			});
+			expect(state.loading).toBe(availability === "missing");
+			expect(state.partial).toBe(availability === "partial");
+			expect(state.hasData).toBe(availability !== "missing");
+		},
+	);
+	it("preserves a full fresh source and timestamp when force fails, while offering scoped retry", () => {
+		const retry = vi.fn();
+		const refetch = vi.fn();
+		const meta = resource([], {
+			sync: { id: "work", state: "failed", errorCode: "TBANK_UNAVAILABLE" },
+		}).meta;
+		const state = section(
+			{ data: [], meta, isError: false, isFetching: false, refetch },
+			retry,
+		);
+		expect(state).toMatchObject({
+			hasData: true,
+			loading: false,
+			error: true,
+			refreshing: false,
+			lastSuccessfulAt: meta.lastSuccessfulAt,
+		});
+		state.retry();
+		expect(retry).toHaveBeenCalledOnce();
+		expect(refetch).not.toHaveBeenCalled();
+	});
+	it("shows source failure without a false loading or empty result", () => {
+		const state = section({
+			data: undefined,
+			meta: resource(null, {
+				sync: { id: "work", state: "failed", errorCode: "TBANK_UNAVAILABLE" },
+			}).meta,
+			isError: false,
+			isFetching: false,
+			refetch: vi.fn(),
+		});
+		expect(state).toMatchObject({
+			hasData: false,
+			loading: false,
+			error: true,
+		});
+	});
+});