feat: render stock logos with signed returns on account page

src/entities/portfolio/model/display.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from "vitest";
-import { formatMoney, formatShare } from "./display";
+import { formatMoney, formatShare, instrumentLogoUrl } from "./display";
 
 describe("portfolio display helpers", () => {
 	it("formats decimal strings without financial arithmetic", () => {
@@ -33,4 +33,15 @@ describe("portfolio display helpers", () => {
 			),
 		).toBeNull();
 	});
+
+	it("builds the brand logo url from an upstream file name", () => {
+		expect(instrumentLogoUrl("sber3.png")).toBe(
+			"https://invest-brands.cdn-tinkoff.ru/sber3x160.png",
+		);
+		expect(instrumentLogoUrl(" RU000A0JPNM1.png ")).toBe(
+			"https://invest-brands.cdn-tinkoff.ru/RU000A0JPNM1x160.png",
+		);
+		expect(instrumentLogoUrl(null)).toBeNull();
+		expect(instrumentLogoUrl("  ")).toBeNull();
+	});
 });