chore: finish frontend ESLint migration #18

Enable every plugin recommended preset and replace Biome with ESLint formatting.

Preserve API contracts and JSX whitespace; verify source, tests, builds and tooling.

src/app/routes/AppRoutes/AllAccounts.test.tsx

@@ -1,3 +1,5 @@
+import type { FC } from "react";
+
 import { MantineProvider } from "@mantine/core";
 import { QueryClientProvider } from "@tanstack/react-query";
 import {
@@ -7,96 +9,104 @@ import {
 	screen,
 	waitFor,
 } from "@testing-library/react";
-import { HttpResponse, http } from "msw";
-import type { FC } from "react";
+import { http, HttpResponse } from "msw";
 import { MemoryRouter, useLocation } from "react-router";
 import { beforeEach, describe, expect, it } from "vitest";
+
 import type { BrokerageOperation } from "@/entities/broker-operation";
 import type { IncomeAnalytics } from "@/entities/income";
 import type { Portfolio } from "@/entities/portfolio";
+
 import { AuthProvider } from "@/features/auth";
 import { createTestQueryClient } from "@/test/query";
 import { resource } from "@/test/resource";
 import { server } from "@/test/server";
+
 import { AppRoutes } from "./AppRoutes";
 
 const accounts = [
 	{ id: "a", name: "Основной" },
 	{ id: "b", name: "ИИС" },
 ];
-const position: Portfolio["positions"][number] = {
-	figi: "SBER",
-	displayName: "Сбербанк",
-	type: "STOCK",
-	quantity: "2",
-	currentValue: { currency: "RUB", value: "600" },
-	absoluteReturn: null,
-	averagePurchasePrice: null,
-	isin: null,
-	ticker: "SBER",
-	logoName: null,
-};
+const position: Portfolio["positions"][number] = (/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+	{
+		absoluteReturn: null,
+		averagePurchasePrice: null,
+		currentValue: { currency: "RUB", value: "600" },
+		displayName: "Сбербанк",
+		figi: "SBER",
+		isin: null,
+		logoName: null,
+		quantity: "2",
+		ticker: "SBER",
+		type: "STOCK",
+	}
+/* eslint-enable unicorn/no-null */);
 const portfolio: Portfolio = {
-	lastSuccessfulAt: "2026-08-15T12:00:00Z",
-	isStale: false,
-	totalsByCurrency: [{ currency: "RUB", value: "1200" }],
-	structure: { currencies: [], unvaluedCategories: [] },
 	cashBalances: [],
-	positions: accounts.map((account) => ({ ...position, account })),
+	isStale: false,
+	lastSuccessfulAt: "2026-08-15T12:00:00Z",
+	positions: accounts.map(account => ({ ...position, account })),
+	structure: { currencies: [], unvaluedCategories: [] },
+	totalsByCurrency: [{ currency: "RUB", value: "1200" }],
 };
-const receipt: BrokerageOperation = {
-	id: "same",
-	occurredAt: "2026-08-15T12:00:00Z",
-	type: "OPERATION_TYPE_COUPON",
-	category: "income",
-	description: "Выплата купона",
-	figi: null,
-	instrumentUid: null,
-	ticker: "BOND",
-	instrumentType: "bond",
-	logoName: null,
-	payment: { currency: "RUB", value: "1" },
-	quantity: null,
-	price: null,
-	accruedInterest: null,
-	commission: null,
-};
-const items = accounts.map((account) => ({ ...receipt, account }));
-const analytics: IncomeAnalytics = {
-	accountId: "all",
-	period: { from: "2026-08-01", to: "2026-08-31" },
-	calculatedAt: "2026-09-01T12:00:00Z",
-	totalsByCurrency: [
-		{
-			currency: "RUB",
-			coupon: { currency: "RUB", value: "2" },
-			dividend: { currency: "RUB", value: "0" },
-			total: { currency: "RUB", value: "2" },
+const receipt: BrokerageOperation = (/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+	{
+		accruedInterest: null,
+		category: "income",
+		commission: null,
+		description: "Выплата купона",
+		figi: null,
+		id: "same",
+		instrumentType: "bond",
+		instrumentUid: null,
+		logoName: null,
+		occurredAt: "2026-08-15T12:00:00Z",
+		payment: { currency: "RUB", value: "1" },
+		price: null,
+		quantity: null,
+		ticker: "BOND",
+		type: "OPERATION_TYPE_COUPON",
+	}
+/* eslint-enable unicorn/no-null */);
+const items = accounts.map(account => ({ ...receipt, account }));
+const analytics: IncomeAnalytics = (/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+	{
+		accountId: "all",
+		bucketGranularity: "day",
+		buckets: [],
+		calculatedAt: "2026-09-01T12:00:00Z",
+		entries: items.map(entry => ({ ...entry, instrumentKey: "bond:RUB" })),
+		instruments: [
+			{
+				coupon: { currency: "RUB", value: "2" },
+				displayName: "Облигация",
+				dividend: { currency: "RUB", value: "0" },
+				figi: null,
+				instrumentType: "bond",
+				instrumentUid: null,
+				key: "bond:RUB",
+				receiptCount: 2,
+				ticker: "BOND",
+				total: { currency: "RUB", value: "2" },
+			},
+		],
+		period: { from: "2026-08-01", to: "2026-08-31" },
+		previous: {
+			period: { from: "2026-07-01", to: "2026-07-31" },
+			totalsByCurrency: [],
 		},
-	],
-	previous: {
-		period: { from: "2026-07-01", to: "2026-07-31" },
-		totalsByCurrency: [],
-	},
-	yearComparison: null,
-	bucketGranularity: "day",
-	buckets: [],
-	instruments: [
-		{
-			key: "bond:RUB",
-			figi: null,
-			instrumentUid: null,
-			ticker: "BOND",
-			instrumentType: "bond",
-			displayName: "Облигация",
-			coupon: { currency: "RUB", value: "2" },
-			dividend: { currency: "RUB", value: "0" },
-			total: { currency: "RUB", value: "2" },
-			receiptCount: 2,
-		},
-	],
-	entries: items.map((entry) => ({ ...entry, instrumentKey: "bond:RUB" })),
-};
+		totalsByCurrency: [
+			{
+				coupon: { currency: "RUB", value: "2" },
+				currency: "RUB",
+				dividend: { currency: "RUB", value: "0" },
+				total: { currency: "RUB", value: "2" },
+			},
+		],
+		yearComparison: null,
+	}
+/* eslint-enable unicorn/no-null */);
 const CurrentLocation: FC = () => {
 	const location = useLocation();
 	return (
@@ -128,18 +138,20 @@ beforeEach(() => {
 		http.post("*/api/v1/auth/refresh", () =>
 			HttpResponse.json({
 				accessToken: "test",
-				user: { id: "user", email: "user@example.com" },
+				user: { email: "user@example.com", id: "user" },
 			}),
 		),
 		http.get("*/api/v1/brokerage-accounts", () =>
 			HttpResponse.json(
 				resource(
-					accounts.map((account) => ({
-						...account,
-						type: "BROKERAGE",
-						openedOn: null,
-						portfolioSummary: null,
-					})),
+					accounts.map(account => ((/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+						{
+							...account,
+							openedOn: null,
+							portfolioSummary: null,
+							type: "BROKERAGE",
+						}
+						/* eslint-enable unicorn/no-null */))),
 				),
 			),
 		),
@@ -150,13 +162,15 @@ beforeEach(() => {
 			"*/api/v1/brokerage-accounts/:accountId/operations",
 			({ params }) =>
 				HttpResponse.json(
-					resource({
-						accountId: params.accountId,
-						items,
-						hasNext: false,
-						nextCursor: null,
-						observedAt: receipt.occurredAt,
-					}),
+					resource((/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+						{
+							accountId: params.accountId,
+							hasNext: false,
+							items,
+							nextCursor: null,
+							observedAt: receipt.occurredAt,
+						}
+						/* eslint-enable unicorn/no-null */)),
 				),
 		),
 		http.get("*/api/v1/brokerage-accounts/:accountId/income-analytics", () =>
@@ -167,20 +181,22 @@ beforeEach(() => {
 				resource({
 					accountId: "all",
 					calculatedAt: receipt.occurredAt,
+					events: accounts.map(account => ((/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+						{
+							account,
+							date: "2026-09-15",
+							dateKind: "event",
+							displayName: "Облигация",
+							figi: null,
+							instrumentUid: null,
+							isin: null,
+							logoName: null,
+							projectedAmount: { currency: "RUB", value: "2" },
+							ticker: "BOND",
+							type: "coupon",
+						}
+						/* eslint-enable unicorn/no-null */))),
 					incomeTotalsByCurrency: [],
-					events: accounts.map((account) => ({
-						account,
-						type: "coupon",
-						date: "2026-09-15",
-						dateKind: "event",
-						figi: null,
-						instrumentUid: null,
-						ticker: "BOND",
-						displayName: "Облигация",
-						isin: null,
-						logoName: null,
-						projectedAmount: { currency: "RUB", value: "2" },
-					})),
 				}),
 			),
 		),
@@ -219,7 +235,7 @@ describe("All accounts routes", () => {
 			);
 		for (const suffix of ["operations", "income", "events"])
 			expect(
-				document.querySelector(`a[href="/accounts/all/${suffix}"]`),
+				screen.getAllByRole("link").find(link => link.getAttribute("href") === `/accounts/all/${suffix}`),
 			).toBeInTheDocument();
 	});
 
@@ -228,24 +244,26 @@ describe("All accounts routes", () => {
 		server.use(
 			http.get(
 				"*/api/v1/brokerage-accounts/:accountId/operations",
-				({ request, params }) => {
+				({ params, request }) => {
 					const url = new URL(request.url);
 					requests.push(url);
 					return HttpResponse.json(
-						resource({
-							accountId: params.accountId,
-							items: [
-								{
-									...receipt,
-									description: url.searchParams.has("cursor")
-										? "Вторая страница"
-										: "Первая страница",
-								},
-							],
-							hasNext: !url.searchParams.has("cursor"),
-							nextCursor: url.searchParams.has("cursor") ? null : "next",
-							observedAt: receipt.occurredAt,
-						}),
+						resource((/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+							{
+								accountId: params.accountId,
+								hasNext: !url.searchParams.has("cursor"),
+								items: [
+									{
+										...receipt,
+										description: url.searchParams.has("cursor")
+											? "Вторая страница"
+											: "Первая страница",
+									},
+								],
+								nextCursor: url.searchParams.has("cursor") ? null : "next",
+								observedAt: receipt.occurredAt,
+							}
+							/* eslint-enable unicorn/no-null */)),
 					);
 				},
 			),
@@ -260,10 +278,10 @@ describe("All accounts routes", () => {
 		fireEvent.click(await screen.findByRole("option", { name: "ИИС" }));
 		await waitFor(() =>
 			expect(
-				requests.some((url) => url.pathname.includes("/b/operations")),
+				requests.some(url => url.pathname.includes("/b/operations")),
 			).toBe(true),
 		);
-		const selected = requests.find((url) =>
+		const selected = requests.find(url =>
 			url.pathname.includes("/b/operations"),
 		);
 		expect(selected?.searchParams.get("from")).toBe("2026-08-01T00:00:00.000Z");
@@ -286,8 +304,8 @@ describe("All accounts routes", () => {
 					: HttpResponse.json(
 							resource({
 								accountId: "all",
-								items,
 								hasNext: true,
+								items,
 								nextCursor: "expired",
 								observedAt: receipt.occurredAt,
 							}),
@@ -305,7 +323,7 @@ describe("All accounts routes", () => {
 	});
 
 	it("retains the complete portfolio during a failed refresh", async () => {
-		const client = renderPage("/accounts/all");
+		const view = renderPage("/accounts/all");
 		await screen.findAllByText("Сбербанк");
 		server.use(
 			http.get("*/api/v1/brokerage-accounts/all/portfolio", () =>
@@ -313,7 +331,7 @@ describe("All accounts routes", () => {
 			),
 		);
 		await act(() =>
-			client.invalidateQueries({
+			view.invalidateQueries({
 				predicate: ({ queryKey }) => String(queryKey[1]).endsWith("/portfolio"),
 			}),
 		);

src/app/routes/AppRoutes/AppRoutes.test.tsx

@@ -2,32 +2,34 @@ import { MantineProvider } from "@mantine/core";
 import { QueryClientProvider } from "@tanstack/react-query";
 import { fireEvent, render, screen } from "@testing-library/react";
 import { cssVariablesResolver, theme } from "@wealthledger/ui/theme";
-import { HttpResponse, http } from "msw";
+import { http, HttpResponse } from "msw";
 import { MemoryRouter } from "react-router";
 import { describe, expect, it } from "vitest";
+
 import { AuthProvider } from "@/features/auth";
 import { createTestQueryClient } from "@/test/query";
 import { server } from "@/test/server";
+
 import { AppRoutes } from "./AppRoutes";
 
-describe("AppRoutes", () => {
-	function renderRoutes(path: string) {
-		return render(
-			<QueryClientProvider client={createTestQueryClient()}>
-				<MemoryRouter initialEntries={[path]}>
-					<MantineProvider
-						cssVariablesResolver={cssVariablesResolver}
-						theme={theme}
-					>
-						<AuthProvider>
-							<AppRoutes />
-						</AuthProvider>
-					</MantineProvider>
-				</MemoryRouter>
-			</QueryClientProvider>,
-		);
-	}
+function renderRoutes(path: string) {
+	return render(
+		<QueryClientProvider client={createTestQueryClient()}>
+			<MemoryRouter initialEntries={[path]}>
+				<MantineProvider
+					cssVariablesResolver={cssVariablesResolver}
+					theme={theme}
+				>
+					<AuthProvider>
+						<AppRoutes />
+					</AuthProvider>
+				</MantineProvider>
+			</MemoryRouter>
+		</QueryClientProvider>,
+	);
+}
 
+describe("AppRoutes", () => {
 	it.each([
 		["/", "Вход"],
 		["/login", "Вход"],
@@ -62,7 +64,7 @@ describe("AppRoutes", () => {
 				credentials = await request.json();
 				return HttpResponse.json({
 					accessToken: "login-token",
-					user: { id: "user-1", email: "user@example.com" },
+					user: { email: "user@example.com", id: "user-1" },
 				});
 			}),
 		);
@@ -96,19 +98,21 @@ describe("AppRoutes", () => {
 			http.post("*/api/v1/auth/login", () =>
 				HttpResponse.json({
 					accessToken: "test",
-					user: { id: "user-1", email: "user@example.com" },
+					user: { email: "user@example.com", id: "user-1" },
 				}),
 			),
 			http.get("*/api/v1/bank-cards", () => HttpResponse.json([])),
 			http.get("*/api/v1/bank-cards/summary", () =>
-				HttpResponse.json({
-					month: "2026-08",
-					cardId: null,
-					expenses: { currency: "RUB", value: "0" },
-					refunds: { currency: "RUB", value: "0" },
-					net: { currency: "RUB", value: "0" },
-					categories: [],
-				}),
+				HttpResponse.json((/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+					{
+						cardId: null,
+						categories: [],
+						expenses: { currency: "RUB", value: "0" },
+						month: "2026-08",
+						net: { currency: "RUB", value: "0" },
+						refunds: { currency: "RUB", value: "0" },
+					}
+					/* eslint-enable unicorn/no-null */)),
 			),
 		);
 		renderRoutes("/cards?month=2026-08");
@@ -132,7 +136,7 @@ describe("AppRoutes", () => {
 			http.post("*/api/v1/auth/refresh", () =>
 				HttpResponse.json({
 					accessToken: "test-token",
-					user: { id: "user-1", email: "user@example.com" },
+					user: { email: "user@example.com", id: "user-1" },
 				}),
 			),
 		);

src/app/routes/AppRoutes/AppRoutes.tsx

@@ -1,6 +1,8 @@
 import type { FC } from "react";
+
 import { lazy } from "react";
 import { Navigate, Route, Routes } from "react-router";
+
 import { LazyPage } from "../RouteFallback";
 import { Protected, Public } from "../RouteGuards";
 
@@ -71,172 +73,172 @@ const ProtectedLayout = lazy(async () => {
 
 const AppRoutes: FC = () => (
 	<Routes>
-		<Route path="/" element={<Navigate to="/accounts" replace />} />
+		<Route element={<Navigate replace to="/accounts" />} path="/" />
 		<Route
-			path="/login"
-			element={
+			element={(
 				<Public>
 					<LazyPage variant="auth">
 						<LoginPage />
 					</LazyPage>
 				</Public>
-			}
+			)}
+			path="/login"
 		/>
 		<Route
-			path="/register"
-			element={
+			element={(
 				<Public>
 					<LazyPage variant="auth">
 						<RegisterPage />
 					</LazyPage>
 				</Public>
-			}
+			)}
+			path="/register"
 		/>
 		<Route
-			element={
+			element={(
 				<Protected>
 					<LazyPage variant="shell">
 						<ProtectedLayout />
 					</LazyPage>
 				</Protected>
-			}
+			)}
 		>
 			<Route
-				path="/cards/:cardId"
-				element={
+				element={(
 					<LazyPage variant="content">
 						<CardPage />
 					</LazyPage>
-				}
+				)}
+				path="/cards/:cardId"
 			/>
 			<Route
-				path="/cards"
-				element={
+				element={(
 					<LazyPage variant="content">
 						<CardsPage />
 					</LazyPage>
-				}
+				)}
+				path="/cards"
 			/>
 			<Route
-				path="/bonds"
-				element={
+				element={(
 					<LazyPage variant="content">
 						<BondsPage />
 					</LazyPage>
-				}
+				)}
+				path="/bonds"
 			/>
 			<Route
-				path="/bonds/:bondId"
-				element={
+				element={(
 					<LazyPage variant="content">
 						<BondPage />
 					</LazyPage>
-				}
+				)}
+				path="/bonds/:bondId"
 			/>
 			<Route
-				path="/stocks"
-				element={
+				element={(
 					<LazyPage variant="content">
 						<StocksPage />
 					</LazyPage>
-				}
+				)}
+				path="/stocks"
 			/>
 			<Route
-				path="/stocks/:stockId"
-				element={
+				element={(
 					<LazyPage variant="content">
 						<StockPage />
 					</LazyPage>
-				}
+				)}
+				path="/stocks/:stockId"
 			/>
 			<Route
-				path="/accounts"
-				element={
+				element={(
 					<LazyPage variant="content">
 						<AccountsPage />
 					</LazyPage>
-				}
+				)}
+				path="/accounts"
 			/>
 			<Route
-				path="/accounts/all"
-				element={
+				element={(
 					<LazyPage variant="content">
 						<AccountPage accountId="all" />
 					</LazyPage>
-				}
+				)}
+				path="/accounts/all"
 			/>
 			<Route
-				path="/accounts/all/operations"
-				element={
+				element={(
 					<LazyPage variant="content">
 						<AccountOperationsPage accountId="all" />
 					</LazyPage>
-				}
+				)}
+				path="/accounts/all/operations"
 			/>
 			<Route
-				path="/accounts/all/income"
-				element={
+				element={(
 					<LazyPage variant="content">
 						<AccountIncomePage accountId="all" />
 					</LazyPage>
-				}
+				)}
+				path="/accounts/all/income"
 			/>
 			<Route
-				path="/accounts/all/events"
-				element={
+				element={(
 					<LazyPage variant="content">
 						<AccountEventsPage accountId="all" />
 					</LazyPage>
-				}
+				)}
+				path="/accounts/all/events"
 			/>
 			<Route
-				path="/accounts/:accountId"
-				element={
+				element={(
 					<LazyPage variant="content">
 						<AccountPage />
 					</LazyPage>
-				}
+				)}
+				path="/accounts/:accountId"
 			/>
 			<Route
-				path="/accounts/:accountId/events"
-				element={
+				element={(
 					<LazyPage variant="content">
 						<AccountEventsPage />
 					</LazyPage>
-				}
+				)}
+				path="/accounts/:accountId/events"
 			/>
 			<Route
-				path="/accounts/:accountId/income"
-				element={
+				element={(
 					<LazyPage variant="content">
 						<AccountIncomePage />
 					</LazyPage>
-				}
+				)}
+				path="/accounts/:accountId/income"
 			/>
 			<Route
-				path="/accounts/:accountId/operations"
-				element={
+				element={(
 					<LazyPage variant="content">
 						<AccountOperationsPage />
 					</LazyPage>
-				}
+				)}
+				path="/accounts/:accountId/operations"
 			/>
 			<Route
-				path="/settings"
-				element={
+				element={(
 					<LazyPage variant="content">
 						<SettingsPage />
 					</LazyPage>
-				}
+				)}
+				path="/settings"
 			/>
 		</Route>
 		<Route
-			path="*"
-			element={
+			element={(
 				<LazyPage variant="content">
 					<NotFoundPage />
 				</LazyPage>
-			}
+			)}
+			path="*"
 		/>
 	</Routes>
 );

src/app/routes/DocumentTitle/DocumentTitle.test.tsx

@@ -1,3 +1,5 @@
+import type { FC } from "react";
+
 import { QueryClientProvider } from "@tanstack/react-query";
 import {
 	act,
@@ -6,24 +8,25 @@ import {
 	screen,
 	waitFor,
 } from "@testing-library/react";
-import { HttpResponse, http } from "msw";
-import type { FC } from "react";
+import { http, HttpResponse } from "msw";
 import { MemoryRouter, useNavigate } from "react-router";
 import { beforeEach, describe, expect, it } from "vitest";
+
 import { AuthProvider } from "@/features/auth";
 import { createTestQueryClient } from "@/test/query";
 import { resource } from "@/test/resource";
 import { server } from "@/test/server";
+
 import { ProtectedDocumentTitle } from "./DocumentTitle";
 
 const Navigation: FC = () => {
 	const navigate = useNavigate();
 	return (
 		<>
-			<button type="button" onClick={() => navigate("/accounts/all/income")}>
+			<button onClick={() => navigate("/accounts/all/income")} type="button">
 				Все счета
 			</button>
-			<button type="button" onClick={() => navigate(-1)}>
+			<button onClick={() => navigate(-1)} type="button">
 				Назад
 			</button>
 		</>
@@ -48,7 +51,7 @@ beforeEach(() => {
 		http.post("*/api/v1/auth/refresh", () =>
 			HttpResponse.json({
 				accessToken: "test-token",
-				user: { id: "user-1", email: "user@example.com" },
+				user: { email: "user@example.com", id: "user-1" },
 			}),
 		),
 	);
@@ -56,10 +59,7 @@ beforeEach(() => {
 
 describe("document titles", () => {
 	it("updates a loading account name and follows account scope and history", async () => {
-		let resolveAccounts!: () => void;
-		const accountsReady = new Promise<void>((resolve) => {
-			resolveAccounts = resolve;
-		});
+		const { promise: accountsReady, resolve: resolveAccounts } = Promise.withResolvers<void>();
 		server.use(
 			http.get("*/api/v1/brokerage-accounts", async () => {
 				await accountsReady;
@@ -68,7 +68,7 @@ describe("document titles", () => {
 		);
 		renderTitle("/accounts/a/income?from=2026-01-01&to=2026-08-31");
 		expect(document.title).toBe("Пассивный доход — Счет — WealthLedger");
-		await act(async () => resolveAccounts());
+		await act(() => Promise.resolve(resolveAccounts()));
 		await waitFor(() =>
 			expect(document.title).toBe("Пассивный доход — ИИС — WealthLedger"),
 		);
@@ -98,15 +98,15 @@ describe("document titles", () => {
 	);
 
 	it("keeps a useful title when the instrument is unavailable", async () => {
-		let requested = false;
+		let isRequested = false;
 		server.use(
 			http.get("*/api/v1/stocks/by-ticker/:ticker", () => {
-				requested = true;
+				isRequested = true;
 				return HttpResponse.json({ code: "NOT_FOUND" }, { status: 404 });
 			}),
 		);
 		renderTitle("/stocks/missing");
-		await waitFor(() => expect(requested).toBe(true));
+		await waitFor(() => expect(isRequested).toBe(true));
 		expect(document.title).toBe("Акция — WealthLedger");
 	});
 });

src/app/routes/DocumentTitle/DocumentTitle.tsx

@@ -1,7 +1,9 @@
-import { useDocumentTitle } from "@mantine/hooks";
 import type { FC } from "react";
+
+import { useDocumentTitle } from "@mantine/hooks";
 import { useTranslation } from "react-i18next";
 import { useMatch } from "react-router";
+
 import { useBankCard } from "@/entities/bank-card";
 import { useBond } from "@/entities/bond";
 import { useBrokerageAccounts } from "@/entities/brokerage-account";
@@ -9,10 +11,9 @@ import { useStock } from "@/entities/stock";
 
 type DocumentTitleProps = { title: string };
 
-const DocumentTitle: FC<DocumentTitleProps> = (props) => {
+const DocumentTitle: FC<DocumentTitleProps> = (props): undefined => {
 	const { t } = useTranslation();
 	useDocumentTitle(`${props.title} — ${t("appName")}`);
-	return null;
 };
 
 type AccountDocumentTitleProps = {
@@ -23,19 +24,29 @@ type AccountDocumentTitleProps = {
 const AccountDocumentTitle: FC<AccountDocumentTitleProps> = (props) => {
 	const { t } = useTranslation();
 	const { data } = useBrokerageAccounts();
-	const accountName =
-		props.accountId === "all"
+	const accountName
+		= props.accountId === "all"
 			? t("accounts.all")
-			: (data?.find((account) => account.id === props.accountId)?.name ??
-				t("account.title"));
-	const section =
-		props.section === "income"
-			? t("income.title")
-			: props.section === "operations"
-				? t("ledger.title")
-				: props.section === "events"
-					? t("events.title")
-					: t("portfolio.title");
+			: (data?.find(account => account.id === props.accountId)?.name
+				?? t("account.title"));
+	let section = t("portfolio.title");
+	switch (props.section ?? "") {
+		case "income": {
+			section = t("income.title");
+			break;
+		}
+		case "operations": {
+			section = t("ledger.title");
+			break;
+		}
+		case "events": {
+			section = t("events.title");
+			break;
+		}
+		default: {
+			break;
+		}
+	}
 	return <DocumentTitle title={`${section} — ${accountName}`} />;
 };
 
@@ -80,21 +91,10 @@ const ProtectedDocumentTitle: FC = () => {
 	if (bond) return <BondDocumentTitle identifier={bond.params.bondId ?? ""} />;
 	if (stock)
 		return <StockDocumentTitle identifier={stock.params.stockId ?? ""} />;
-	return (
-		<DocumentTitle
-			title={t(
-				cards
-					? "navigation.cards"
-					: bonds
-						? "navigation.bonds"
-						: stocks
-							? "navigation.stocks"
-							: settings
-								? "navigation.settings"
-								: "navigation.accounts",
-			)}
-		/>
-	);
+	if (cards) return <DocumentTitle title={t("navigation.cards")} />;
+	if (bonds) return <DocumentTitle title={t("navigation.bonds")} />;
+	if (stocks) return <DocumentTitle title={t("navigation.stocks")} />;
+	return settings ? <DocumentTitle title={t("navigation.settings")} /> : <DocumentTitle title={t("navigation.accounts")} />;
 };
 
 export { ProtectedDocumentTitle };

src/app/routes/ProtectedLayout.tsx

@@ -1,5 +1,7 @@
 import type { FC } from "react";
+
 import { AppBreadcrumbs, AppShell } from "@/app/ui";
+
 import { ProtectedDocumentTitle } from "./DocumentTitle/DocumentTitle";
 
 const ProtectedLayout: FC = () => {

src/app/routes/RouteErrorBoundary/RouteErrorBoundary.test.tsx

@@ -3,11 +3,14 @@ import { fireEvent, render, screen } from "@testing-library/react";
 import { type FC, lazy, Suspense } from "react";
 import { MemoryRouter, useLocation, useNavigate } from "react-router";
 import { describe, expect, it, vi } from "vitest";
+
 import { RouteErrorBoundary } from "./RouteErrorBoundary";
 
-let authenticated = false;
+const session = { isAuthenticated: false };
 vi.mock("@/features/auth", () => ({
-	useAuth: () => ({ user: authenticated ? {} : null }),
+	useAuth: () => ((/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+		{ user: session.isAuthenticated ? {} : null }
+		/* eslint-enable unicorn/no-null */)),
 }));
 
 const ThrowingRoute: FC = () => {
@@ -17,11 +20,13 @@ const ThrowingRoute: FC = () => {
 const HealthyRoute: FC = () => {
 	return (
 		<div>
-			{useLocation().pathname === "/healthy" ? (
-				"healthy route"
-			) : (
-				<ThrowingRoute />
-			)}
+			{useLocation().pathname === "/healthy"
+				? (
+						"healthy route"
+					)
+				: (
+						<ThrowingRoute />
+					)}
 		</div>
 	);
 };
@@ -31,7 +36,7 @@ const RouteHarness: FC = () => {
 
 	return (
 		<>
-			<button type="button" onClick={() => navigate("/healthy")}>
+			<button onClick={() => navigate("/healthy")} type="button">
 				go healthy
 			</button>
 			<RouteErrorBoundary>
@@ -55,10 +60,10 @@ describe("RouteErrorBoundary", () => {
 	it.each(["/accounts", "/login"])(
 		"recovers a transient failure through the fallback on %s itself",
 		async (path) => {
-			authenticated = path === "/accounts";
-			let failing = true;
+			session.isAuthenticated = path === "/accounts";
+			let isFailing = true;
 			const RecoverableRoute: FC = () => {
-				if (failing) throw new Error("temporary failure");
+				if (isFailing) throw new Error("temporary failure");
 				return <div>recovered route</div>;
 			};
 			render(
@@ -71,14 +76,14 @@ describe("RouteErrorBoundary", () => {
 				</MantineProvider>,
 			);
 			const action = screen.getByRole("link", { name: "Продолжить" });
-			failing = false;
+			isFailing = false;
 			fireEvent.click(action);
 			expect(await screen.findByText("recovered route")).toBeInTheDocument();
 		},
 	);
 
 	it("keeps a persistent failure recoverable without an automatic reset loop", () => {
-		authenticated = true;
+		session.isAuthenticated = true;
 		renderBoundary("/accounts");
 		fireEvent.click(screen.getByRole("link", { name: "Продолжить" }));
 		expect(
@@ -91,7 +96,7 @@ describe("RouteErrorBoundary", () => {
 	});
 
 	it("offers document navigation when React.lazy caches a rejected chunk", async () => {
-		authenticated = false;
+		session.isAuthenticated = false;
 		const load = vi.fn(() => Promise.reject(new Error("chunk failed")));
 		const Chunk = lazy(load);
 		render(
@@ -110,18 +115,18 @@ describe("RouteErrorBoundary", () => {
 		const reload = screen.getByRole("link", { name: "Перезагрузить страницу" });
 		expect(reload).toHaveAttribute("href", "/login");
 		// Cancel browser navigation in JSDOM only after proving React Router did not intercept it.
-		let intercepted = true;
+		let isIntercepted = true;
 		const preventNavigation = (event: MouseEvent) => {
-			intercepted = event.defaultPrevented;
+			isIntercepted = event.defaultPrevented;
 			event.preventDefault();
 		};
 		document.addEventListener("click", preventNavigation, { once: true });
 		fireEvent.click(reload);
-		expect(intercepted).toBe(false);
+		expect(isIntercepted).toBe(false);
 	});
 
 	it("offers login after a public route error without error details", () => {
-		authenticated = false;
+		session.isAuthenticated = false;
 		renderBoundary("/login");
 		expect(document.title).toBe("Не удалось открыть страницу — WealthLedger");
 		expect(screen.getByRole("link", { name: "Продолжить" })).toHaveAttribute(
@@ -132,9 +137,9 @@ describe("RouteErrorBoundary", () => {
 	});
 
 	it("offers accounts after a protected route error and resets on navigation", async () => {
-		authenticated = true;
+		session.isAuthenticated = true;
 		renderBoundary("/accounts");
-		screen.getByRole("button", { name: "go healthy" }).click();
+		fireEvent.click(screen.getByRole("button", { name: "go healthy" }));
 		expect(await screen.findByText("healthy route")).toBeInTheDocument();
 	});
 });

src/app/routes/RouteErrorBoundary/RouteErrorBoundary.tsx

@@ -1,14 +1,16 @@
+import type { FC, PropsWithChildren } from "react";
+
 import { Button, Stack, Text, Title } from "@mantine/core";
 import { useDocumentTitle } from "@mantine/hooks";
-import type { FC, PropsWithChildren } from "react";
 import { Component } from "react";
 import { useTranslation } from "react-i18next";
 import { Link, useLocation } from "react-router";
+
 import { useAuth } from "@/features/auth";
 
 type BoundaryProps = PropsWithChildren<{
-	routeKey: string;
 	authenticated: boolean;
+	routeKey: string;
 }>;
 
 type RouteErrorFallbackProps = {
@@ -18,12 +20,12 @@ type RouteErrorFallbackProps = {
 type State = { hasError: boolean };
 
 class Boundary extends Component<BoundaryProps, State> {
-	state: State = { hasError: false };
-
 	static getDerivedStateFromError(): State {
 		return { hasError: true };
 	}
 
+	state: State = { hasError: false };
+
 	componentDidUpdate(previousProps: BoundaryProps) {
 		if (previousProps.routeKey !== this.props.routeKey && this.state.hasError) {
 			this.setState({ hasError: false });
@@ -31,10 +33,7 @@ class Boundary extends Component<BoundaryProps, State> {
 	}
 
 	render() {
-		if (this.state.hasError) {
-			return <RouteErrorFallback authenticated={this.props.authenticated} />;
-		}
-		return this.props.children;
+		return this.state.hasError ? <RouteErrorFallback authenticated={this.props.authenticated} /> : this.props.children;
 	}
 }
 
@@ -60,7 +59,7 @@ const RouteErrorFallback: FC<RouteErrorFallbackProps> = (props) => {
 
 const RouteErrorBoundary: FC<PropsWithChildren> = (props) => {
 	const { children } = props;
-	const { pathname, search, key } = useLocation();
+	const { key, pathname, search } = useLocation();
 	const { user } = useAuth();
 
 	return (

src/app/routes/RouteFallback.tsx

@@ -1,11 +1,13 @@
-import { Container, Group, Skeleton, Stack } from "@mantine/core";
 import type { FC, PropsWithChildren } from "react";
+
+import { Container, Group, Skeleton, Stack } from "@mantine/core";
 import { Suspense } from "react";
 import { useTranslation } from "react-i18next";
+
 import { RouteTransition } from "./RouteTransition";
 
-type RouteSkeletonVariant = "auth" | "content" | "shell";
 type LazyPageProps = PropsWithChildren<{ variant: RouteSkeletonVariant }>;
+type RouteSkeletonVariant = "auth" | "content" | "shell";
 
 const RouteSkeleton: FC<{ variant: RouteSkeletonVariant }> = (props) => {
 	const { variant } = props;
@@ -13,7 +15,7 @@ const RouteSkeleton: FC<{ variant: RouteSkeletonVariant }> = (props) => {
 
 	if (variant === "auth")
 		return (
-			<Container size={420} py="xl">
+			<Container py="xl" size={420}>
 				<Stack
 					aria-busy="true"
 					aria-label={t("states.loadingTitle")}
@@ -61,11 +63,13 @@ const LazyPage: FC<LazyPageProps> = (props) => {
 	const { children, variant } = props;
 	return (
 		<Suspense fallback={<RouteSkeleton variant={variant} />}>
-			{variant === "shell" ? (
-				children
-			) : (
-				<RouteTransition>{children}</RouteTransition>
-			)}
+			{variant === "shell"
+				? (
+						children
+					)
+				: (
+						<RouteTransition>{children}</RouteTransition>
+					)}
 		</Suspense>
 	);
 };

src/app/routes/RouteGuards.tsx

@@ -1,37 +1,43 @@
 import type { FC, PropsWithChildren } from "react";
+
 import { Navigate, useLocation } from "react-router";
+
 import { useAuth } from "@/features/auth";
+
 import { RouteSkeleton } from "./RouteFallback";
 
 const Protected: FC<PropsWithChildren> = (props) => {
 	const { children } = props;
-	const { user, ready } = useAuth();
+	const { ready, user } = useAuth();
 	const location = useLocation();
 	if (!ready) return <RouteSkeleton variant="shell" />;
-	return user ? (
-		children
-	) : (
-		<Navigate
-			to="/login"
-			state={{ returnTo: `${location.pathname}${location.search}` }}
-			replace
-		/>
-	);
+	return user
+		? (
+				<>{children}</>
+			)
+		: (
+				<Navigate
+					replace
+					state={{ returnTo: `${location.pathname}${location.search}` }}
+					to="/login"
+				/>
+			);
 };
 
 const Public: FC<PropsWithChildren> = (props) => {
 	const { children } = props;
-	const { user, ready } = useAuth();
+	const { ready, user } = useAuth();
 	const location = useLocation();
-	const requested = (location.state as { returnTo?: string } | null)?.returnTo;
-	const returnTo =
-		typeof requested === "string" &&
-		requested.startsWith("/") &&
-		!requested.startsWith("//")
+
+	if (!ready) return <RouteSkeleton variant="shell" />;
+	const requested = (location.state as null | { returnTo?: string })?.returnTo;
+	const returnTo
+		= typeof requested === "string"
+			&& requested.startsWith("/")
+			&& !requested.startsWith("//")
 			? requested
 			: "/accounts";
-	if (!ready) return <RouteSkeleton variant="shell" />;
-	return user ? <Navigate to={returnTo} replace /> : children;
+	return user ? <Navigate replace to={returnTo} /> : <>{children}</>;
 };
 
 export { Protected, Public };

src/app/routes/RouteTransition.tsx

@@ -1,6 +1,7 @@
+import type { FC, PropsWithChildren } from "react";
+
 import { domAnimation, LazyMotion, useReducedMotion } from "motion/react";
 import * as m from "motion/react-m";
-import type { FC, PropsWithChildren } from "react";
 import { useLocation } from "react-router";
 
 const TRANSITION_DURATION_SECONDS = 0.2;
@@ -13,9 +14,9 @@ const RouteTransition: FC<PropsWithChildren> = (props) => {
 	return (
 		<LazyMotion features={domAnimation}>
 			<m.div
-				key={pathname}
-				initial={reduceMotion ? false : { opacity: 0 }}
 				animate={{ opacity: 1 }}
+				initial={!reduceMotion && { opacity: 0 }}
+				key={pathname}
 				transition={{
 					duration: reduceMotion ? 0 : TRANSITION_DURATION_SECONDS,
 					ease: "easeOut",