refactor: address frontend review feedback

src/entities/portfolio/api/resource-lifecycle.test.tsx

@@ -56,7 +56,7 @@ describe("persistent resource query lifecycle", () => {
 		await waitFor(() => expect(result.current.isSuccess).toBe(true));
 		await act(() => result.current.observe("new"));
 		await waitFor(() => expect(result.current.meta?.stateVersion).toBe("new"));
-		// eslint-disable-next-line unicorn/no-null -- Preserve the API/DOM null sentinel in the expected response.
+
 		expect(modes).toEqual([null, "observe", "observe"]);
 		expect(queryClient.getQueryCache().getAll()).toHaveLength(1);
 		expect(
@@ -89,14 +89,13 @@ describe("persistent resource query lifecycle", () => {
 		expect(result.current.status).toBe("pending");
 		expect(result.current.isPending).toBe(true);
 		expect(result.current.isLoading).toBe(false);
-		/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+
 		expect(result.current.transport).toEqual(
 			{
 				error: null,
 				fetchStatus: "idle",
 				status: "success",
 			},
-			/* eslint-enable unicorn/no-null */
 		);
 		expect(result.current.meta?.availability).toBe("missing");
 	});

src/entities/portfolio/model/display.ts

@@ -9,15 +9,12 @@ function formatShare(
 	denominator: Money | null,
 ): null | string {
 	if (!numerator || !denominator)
-		// eslint-disable-next-line unicorn/no-null -- The existing formatter contract uses null for unavailable data.
 		return null;
 	const total = Number(denominator.value);
 	if (!Number.isFinite(total) || total <= 0)
-		// eslint-disable-next-line unicorn/no-null -- The existing formatter contract uses null for unavailable data.
 		return null;
 	const percent = (Number(numerator.value) / total) * PERCENT_SCALE;
 	if (!Number.isFinite(percent))
-		// eslint-disable-next-line unicorn/no-null -- The existing formatter contract uses null for unavailable data.
 		return null;
 
 	const rounded = new Intl.NumberFormat("ru-RU", {