refactor: tighten types and reuse instrument UI

src/pages/account/ui/AccountPage/AccountPage.test.tsx

@@ -67,7 +67,7 @@ function renderPage(ui: React.ReactNode) {
 	);
 }
 
-const portfolio: Portfolio
+const portfolio
 	= {
 		cashBalances: [{ currency: "USD", value: "0.5" }],
 		isStale: true,
@@ -97,10 +97,10 @@ const portfolio: Portfolio
 				ticker: null,
 				type: "BOND",
 			},
-		],
+		] satisfies [Portfolio["positions"][number], ...Portfolio["positions"]],
 		structure: { currencies: [], unvaluedCategories: [] },
 		totalsByCurrency: [{ currency: "RUB", value: "1234.5" }],
-	};
+	} satisfies Portfolio;
 
 function position(
 	overrides: Partial<Portfolio["positions"][number]>,

src/pages/account/ui/AccountPage/position-groups.test.tsx

@@ -1,7 +1,7 @@
 import { MantineProvider } from "@mantine/core";
 import { render, screen, within } from "@testing-library/react";
 import { MemoryRouter } from "react-router";
-import { describe, expect, it } from "vitest";
+import { assert, describe, expect, it } from "vitest";
 
 import { toAccountPagePositionSections } from "../../model/positions";
 import { portfolio, position, second } from "../../model/positions.fixtures";
@@ -13,6 +13,8 @@ describe("Positions grouped by security", () => {
 			...portfolio, positions: [position, second],
 		})[0];
 
+		assert.isDefined(section);
+
 		render(
 			<MantineProvider>
 				<MemoryRouter>
@@ -27,6 +29,8 @@ describe("Positions grouped by security", () => {
 		).getAllByRole("listitem");
 
 		expect(rows).toHaveLength(2);
+		assert.isDefined(rows[0]);
+		assert.isDefined(rows[1]);
 		expect(
 			within(rows[0]).getByRole("link", { name: "Основной" }),
 		).toHaveAttribute("href", "/accounts/a");

src/pages/account/ui/AccountPage/position-layout.browser.test.tsx

@@ -6,7 +6,7 @@ import { MantineProvider } from "@mantine/core";
 // eslint-disable-next-line testing-library/no-manual-cleanup -- Vitest globals are disabled, so RTL cannot register its automatic afterEach cleanup.
 import { cleanup, render, screen } from "@testing-library/react";
 import { cssVariablesResolver, theme } from "@wealthledger/ui/theme";
-import { afterEach, expect, it } from "vitest";
+import { afterEach, assert, expect, it } from "vitest";
 
 import type { AccountPagePosition, AccountPagePositionSection } from "../../model/positions";
 
@@ -76,6 +76,7 @@ it("keeps expanded positions vertical while other positions adapt to the viewpor
 			expect(current.height, context).toBeGreaterThan(0);
 			if (index === 0) continue;
 			const previous = bounds[index - 1];
+			assert.isDefined(previous);
 
 			if (kind === "other" && width === 1280) {
 				// eslint-disable-next-line vitest/no-conditional-expect -- The fixed table case selects the expected outcome; every case asserts its own branch.