refactor: enforce frontend view model boundaries

src/features/tbank-connection/model/connection-boundary.ts

@@ -31,6 +31,7 @@ function commitTbankConnectionBoundary(
 	void queryClient.resetQueries({
 		predicate: ({ queryKey }) => {
 			const [method, path] = queryKey;
+
 			return (
 				method === "get"
 				&& typeof path === "string"

src/features/tbank-connection/model/screen-sync.test.tsx

@@ -19,11 +19,14 @@ function auth() {
 		refresh: () => Promise.resolve(true),
 	});
 }
+
 describe("page-owned screen synchronization", () => {
 	it("ignores a late sync acceptance after the account scope changes", async () => {
 		auth();
 
-		const { promise: blocked, resolve: release } = Promise.withResolvers<void>();
+		const { promise: blocked, resolve: release }
+			= Promise.withResolvers<void>();
+
 		const posted: string[] = [];
 		const polled: string[] = [];
 		server.use(
@@ -32,8 +35,10 @@ describe("page-owned screen synchronization", () => {
 					accountId: string;
 					screen: "account";
 				};
+
 				posted.push(scope.accountId);
 				await blocked;
+
 				return HttpResponse.json(
 					{ id: scope.accountId, now: "2026-09-25T00:00:00Z", scope },
 					{ status: 202 },
@@ -41,6 +46,7 @@ describe("page-owned screen synchronization", () => {
 			}),
 			http.get("*/api/v1/tbank-sync/:id", ({ params }) => {
 				polled.push(String(params.id));
+
 				return HttpResponse.json({
 					id: params.id,
 					resources: [],
@@ -48,6 +54,7 @@ describe("page-owned screen synchronization", () => {
 				});
 			}),
 		);
+
 		const { rerender, result } = renderHook(
 			({ accountId }) => useScreenSync({ accountId, screen: "account" }, []),
 			{
@@ -55,6 +62,7 @@ describe("page-owned screen synchronization", () => {
 				wrapper: createQueryWrapper().wrapper,
 			},
 		);
+
 		let pending!: Promise<void>;
 		act(() => {
 			pending = result.current.refresh();
@@ -79,6 +87,7 @@ describe("page-owned screen synchronization", () => {
 			server.use(
 				http.get("*/api/v1/brokerage-accounts", ({ request }) => {
 					modes.push(new URL(request.url).searchParams.get("sync"));
+
 					return isUnavailable
 						? HttpResponse.json({ code: "UNAVAILABLE" }, { status: 503 })
 						: HttpResponse.json(
@@ -87,14 +96,17 @@ describe("page-owned screen synchronization", () => {
 				}),
 				http.post("*/api/v1/tbank-sync", () => {
 					posts += 1;
+
 					return new HttpResponse(null, { status: 500 });
 				}),
 			);
 			const { queryClient, wrapper } = createQueryWrapper();
+
 			const { result } = renderHook(
 				() => {
 					const accounts = useBrokerageAccounts();
 					const disabled = useStockQuote("");
+
 					return {
 						accounts,
 						disabled,
@@ -103,6 +115,7 @@ describe("page-owned screen synchronization", () => {
 				},
 				{ wrapper },
 			);
+
 			if (cached) {
 				await waitFor(() =>
 					// eslint-disable-next-line vitest/no-conditional-expect -- The fixed table case selects the expected outcome; every case asserts its own branch.
@@ -111,6 +124,7 @@ describe("page-owned screen synchronization", () => {
 				isUnavailable = true;
 				await act(() => result.current.accounts.refetch());
 			}
+
 			await waitFor(() => expect(result.current.accounts.isError).toBe(true));
 			isUnavailable = false;
 			await act(() => result.current.sync.retry());
@@ -119,7 +133,14 @@ describe("page-owned screen synchronization", () => {
 				cached ? "3" : "2",
 			);
 			expect(modes).toEqual(
-				cached ? [null, /* eslint-disable-line unicorn/no-null -- Exercise the explicit null returned by the production API/DOM contract. */ null, "observe"] : [null, "observe"],
+				cached
+					? [
+							null, // eslint-disable-line unicorn/no-null -- Preserve explicit null in the API fixture.
+							// eslint-disable-next-line unicorn/no-null -- Exercise the explicit null returned by the production API/DOM contract.
+							null,
+							"observe",
+						]
+					: [null, "observe"], // eslint-disable-line unicorn/no-null -- Preserve explicit null in the API fixture.
 			);
 			expect(posts).toBe(0);
 			expect(result.current.disabled.data).toBeUndefined();
@@ -141,7 +162,9 @@ describe("page-owned screen synchronization", () => {
 		async (boundary, pending) => {
 			auth();
 
-			const { promise: blocked, resolve: release } = Promise.withResolvers<void>();
+			const { promise: blocked, resolve: release }
+				= Promise.withResolvers<void>();
+
 			let isRecovering = false;
 			let isChanged = false;
 			server.use(
@@ -154,18 +177,22 @@ describe("page-owned screen synchronization", () => {
 							: HttpResponse.json({ code: "UNAVAILABLE" }, { status: 503 });
 					isRecovering = true;
 					await blocked;
+
 					return HttpResponse.json(resource([], { stateVersion: "old" }));
 				}),
 			);
 			const { queryClient, wrapper } = createQueryWrapper();
 			const published: unknown[] = [];
+
 			const unsubscribe = queryClient.getQueryCache().subscribe((event) => {
 				if (event.type === "updated" && event.action.type === "success")
 					published.push(event.query.state.data);
 			});
+
 			const { result } = renderHook(
 				() => {
 					const accounts = useBrokerageAccounts();
+
 					return {
 						accounts,
 						sync: useScreenSync({ screen: "accounts" }, [accounts]),
@@ -173,6 +200,7 @@ describe("page-owned screen synchronization", () => {
 				},
 				{ wrapper },
 			);
+
 			await waitFor(() => expect(result.current.accounts.isError).toBe(true));
 			let recovery!: Promise<void>;
 			act(() => {
@@ -182,6 +210,7 @@ describe("page-owned screen synchronization", () => {
 			if (pending) await waitFor(() => expect(isRecovering).toBe(true));
 			await act(async () => {
 				isChanged = true;
+
 				switch (boundary) {
 					case "access": {
 						invalidateResourceAccess(queryClient, "brokerage", {
@@ -190,24 +219,29 @@ describe("page-owned screen synchronization", () => {
 
 						break;
 					}
+
 					case "logout": {
 						configureAuthClient();
 						queryClient.clear();
 
 						break;
 					}
+
 					case "session": {
 						auth();
 						queryClient.clear();
 
 						break;
 					}
-					case "connection": { commitTbankConnectionBoundary(queryClient, {
-						connected: true,
-						connectedAt: "2026-09-27T00:00:00Z",
-					});
+
+					case "connection": {
+						commitTbankConnectionBoundary(queryClient, {
+							connected: true,
+							connectedAt: "2026-09-27T00:00:00Z",
+						});
 					}
 				}
+
 				release();
 				await recovery;
 			});
@@ -233,6 +267,7 @@ describe("page-owned screen synchronization", () => {
 			server.use(
 				http.get("*/api/v1/brokerage-accounts", ({ request }) => {
 					modes.push(new URL(request.url).searchParams.get("sync"));
+
 					return modes.length === 1
 						? HttpResponse.json({ code: "UNAVAILABLE" }, { status: 503 })
 						: HttpResponse.json(resource([]));
@@ -242,6 +277,7 @@ describe("page-owned screen synchronization", () => {
 				),
 				http.get("*/api/v1/tbank-sync/:id", () => {
 					polls += 1;
+
 					return retryStatus && polls === 1
 						? HttpResponse.json({ code: "UNAVAILABLE" }, { status: 503 })
 						: HttpResponse.json({
@@ -252,10 +288,12 @@ describe("page-owned screen synchronization", () => {
 				}),
 			);
 			const { queryClient, wrapper } = createQueryWrapper();
+
 			const { result } = renderHook(
 				() => {
 					const accounts = useBrokerageAccounts();
 					const disabled = useStockQuote("");
+
 					return {
 						accounts,
 						sync: useScreenSync({ screen: "accounts" }, [accounts, disabled]),
@@ -263,9 +301,11 @@ describe("page-owned screen synchronization", () => {
 				},
 				{ wrapper },
 			);
+
 			await waitFor(() => expect(result.current.accounts.isError).toBe(true));
 			expect(result.current.accounts.meta).toBeUndefined();
 			await act(() => result.current.sync.refresh());
+
 			if (retryStatus) {
 				await waitFor(() =>
 					// eslint-disable-next-line vitest/no-conditional-expect -- The fixed table case selects the expected outcome; every case asserts its own branch.
@@ -273,6 +313,7 @@ describe("page-owned screen synchronization", () => {
 				);
 				await act(() => result.current.sync.retry());
 			}
+
 			await waitFor(() => expect(result.current.accounts.isSuccess).toBe(true));
 			expect(result.current.accounts.data).toEqual([]);
 			// eslint-disable-next-line unicorn/no-null -- Preserve the API/DOM null sentinel in the expected response.
@@ -290,16 +331,20 @@ describe("page-owned screen synchronization", () => {
 		const bodies: unknown[] = [];
 		let isCompleted = false;
 		let polls = 0;
+
 		const meta = () =>
 			resource([], { stateVersion: isCompleted ? "2" : "1" }).meta;
+
 		server.use(
 			http.get("*/api/v1/brokerage-accounts", ({ request }) => {
 				modes.push(new URL(request.url).searchParams.get("sync"));
+
 				return HttpResponse.json(resource([], meta()));
 			}),
 			http.post("*/api/v1/tbank-sync", async ({ request }) => {
 				bodies.push(await request.json());
 				isCompleted = true;
+
 				return HttpResponse.json(
 					{
 						id: "screen",
@@ -311,7 +356,10 @@ describe("page-owned screen synchronization", () => {
 			}),
 			http.get("*/api/v1/tbank-sync/:id", () => {
 				polls++;
-				return HttpResponse.json((/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+
+				/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+
+				return HttpResponse.json(
 					{
 						errorCode: null,
 						id: "screen",
@@ -320,13 +368,16 @@ describe("page-owned screen synchronization", () => {
 						resources: [meta()],
 						scope: { screen: "accounts" },
 						state: "succeeded",
-					}
-					/* eslint-enable unicorn/no-null */));
+					},
+					/* eslint-enable unicorn/no-null */
+				);
 			}),
 		);
+
 		const { result, unmount } = renderHook(
 			() => {
 				const accounts = useBrokerageAccounts();
+
 				return {
 					accounts,
 					sync: useScreenSync({ screen: "accounts" }, [accounts]),
@@ -334,6 +385,7 @@ describe("page-owned screen synchronization", () => {
 			},
 			{ wrapper: createQueryWrapper().wrapper },
 		);
+
 		await waitFor(() => expect(result.current.accounts.data).toEqual([]));
 		await act(async () => {
 			await Promise.all([
@@ -348,6 +400,7 @@ describe("page-owned screen synchronization", () => {
 		// eslint-disable-next-line unicorn/no-null -- Preserve the API/DOM null sentinel in the expected response.
 		expect(modes).toEqual([null, "observe"]);
 		vi.useFakeTimers();
+
 		try {
 			await act(() => vi.advanceTimersByTimeAsync(120_000));
 			expect(polls).toBe(1);
@@ -365,26 +418,36 @@ describe("page-owned screen synchronization", () => {
 		"publishes completed empty coverage while history runs, then stops on %s",
 		async (boundary) => {
 			vi.useFakeTimers({ toFake: ["Date"] });
+
 			try {
 				auth();
 				let isCompleted = false;
 				let polls = 0;
 				const modes: (null | string)[] = [];
+
 				const snapshot = () =>
-					resource(isCompleted ? [] : /* eslint-disable-line unicorn/no-null -- Exercise the explicit null returned by the production API/DOM contract. */ null, (/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+					resource(
+						isCompleted
+							? []
+							: null, // eslint-disable-line unicorn/no-null -- Preserve the nullable API fixture.
 						{
 							stateVersion: isCompleted ? "covered" : "initial",
-							sync: { errorCode: null, id: "history", state: "running" },
-						}
-						/* eslint-enable unicorn/no-null */));
+							sync: { errorCode: null, id: "history", state: "running" }, // eslint-disable-line unicorn/no-null -- Preserve explicit null in the API fixture.
+						},
+					);
+
 				server.use(
 					http.get("*/api/v1/brokerage-accounts", ({ request }) => {
 						modes.push(new URL(request.url).searchParams.get("sync"));
+
 						return HttpResponse.json(snapshot());
 					}),
 					http.get("*/api/v1/tbank-sync/:id", () => {
 						polls++;
-						return HttpResponse.json((/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+
+						/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+
+						return HttpResponse.json(
 							{
 								errorCode: null,
 								id: "history",
@@ -397,13 +460,16 @@ describe("page-owned screen synchronization", () => {
 								resources: [snapshot().meta],
 								scope: null,
 								state: "running",
-							}
-							/* eslint-enable unicorn/no-null */));
+							},
+							/* eslint-enable unicorn/no-null */
+						);
 					}),
 				);
+
 				const { result, unmount } = renderHook(
 					() => {
 						const accounts = useBrokerageAccounts();
+
 						return {
 							accounts,
 							sync: useScreenSync({ screen: "accounts" }, [accounts]),
@@ -411,6 +477,7 @@ describe("page-owned screen synchronization", () => {
 					},
 					{ wrapper: createQueryWrapper().wrapper },
 				);
+
 				await waitFor(() =>
 					expect(result.current.accounts.meta?.sync.id).toBe("history"),
 				);
@@ -447,20 +514,25 @@ describe("page-owned screen synchronization", () => {
 		server.use(
 			http.get("*/api/v1/brokerage-accounts", () =>
 				HttpResponse.json(
-					resource([], (/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+					resource(
+						/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+						[],
 						{
 							sync: { errorCode: null, id: "revoked", state: "running" },
-						}
-						/* eslint-enable unicorn/no-null */)),
+						},
+						/* eslint-enable unicorn/no-null */
+					),
 				),
 			),
 			http.get("*/api/v1/tbank-sync/:id", () =>
 				HttpResponse.json({ code: "INVALID_TBANK_TOKEN" }, { status: 400 }),
 			),
 		);
+
 		const { result } = renderHook(
 			() => {
 				const accounts = useBrokerageAccounts();
+
 				return {
 					accounts,
 					sync: useScreenSync({ screen: "accounts" }, [accounts]),
@@ -468,6 +540,7 @@ describe("page-owned screen synchronization", () => {
 			},
 			{ wrapper: createQueryWrapper().wrapper },
 		);
+
 		await waitFor(() => expect(result.current.accounts.isError).toBe(true));
 		expect(result.current.accounts.data).toBeUndefined();
 	});
@@ -475,7 +548,10 @@ describe("page-owned screen synchronization", () => {
 		auth();
 		let isObserved = false;
 		const modes: (null | string)[] = [];
-		const dependency = resource([], (/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+
+		const dependency = resource(
+			/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+			[],
 			{
 				resourceKey: "operations",
 				stateVersion: isObserved ? "covered" : "initial",
@@ -484,24 +560,36 @@ describe("page-owned screen synchronization", () => {
 					id: "dependency",
 					state: isObserved ? "idle" : "running",
 				},
-			}
-			/* eslint-enable unicorn/no-null */)).meta;
+			},
+			/* eslint-enable unicorn/no-null */
+		).meta;
+
 		server.use(
 			http.get("*/api/v1/brokerage-accounts", ({ request }) => {
 				const mode = new URL(request.url).searchParams.get("sync");
 				modes.push(mode);
 				if (mode) isObserved = true;
+
 				return HttpResponse.json(
-					resource(isObserved ? [] : /* eslint-disable-line unicorn/no-null -- Exercise the explicit null returned by the production API/DOM contract. */ null, {
-						dependencies: [
-							{ ...dependency, stateVersion: isObserved ? "covered" : "initial" },
-						],
-						resourceKey: "projection",
-					}),
+					resource(
+						isObserved
+							? []
+							: null, // eslint-disable-line unicorn/no-null -- Exercise the explicit null returned by the production API/DOM contract.
+						{
+							dependencies: [
+								{
+									...dependency,
+									stateVersion: isObserved ? "covered" : "initial",
+								},
+							],
+							resourceKey: "projection",
+						},
+					),
 				);
 			}),
 			http.get("*/api/v1/tbank-sync/:id", () =>
-				HttpResponse.json((/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+				/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+				HttpResponse.json(
 					{
 						errorCode: null,
 						id: "dependency",
@@ -510,18 +598,22 @@ describe("page-owned screen synchronization", () => {
 						resources: [{ ...dependency, stateVersion: "covered" }],
 						scope: null,
 						state: "succeeded",
-					}
-					/* eslint-enable unicorn/no-null */)),
+					},
+					/* eslint-enable unicorn/no-null */
+				),
 			),
 		);
+
 		const { result } = renderHook(
 			() => {
 				const accounts = useBrokerageAccounts();
 				useScreenSync({ screen: "accounts" }, [accounts]);
+
 				return accounts;
 			},
 			{ wrapper: createQueryWrapper().wrapper },
 		);
+
 		await waitFor(() => expect(result.current.data).toEqual([]));
 		// eslint-disable-next-line unicorn/no-null -- Preserve the API/DOM null sentinel in the expected response.
 		expect(modes).toEqual([null, "observe"]);
@@ -536,9 +628,11 @@ describe("page-owned screen synchronization", () => {
 				HttpResponse.json({ code: "TBANK_UNAVAILABLE" }, { status: 503 }),
 			),
 		);
+
 		const { result } = renderHook(
 			() => {
 				const accounts = useBrokerageAccounts();
+
 				return {
 					accounts,
 					sync: useScreenSync({ screen: "accounts" }, [accounts]),
@@ -546,6 +640,7 @@ describe("page-owned screen synchronization", () => {
 			},
 			{ wrapper: createQueryWrapper().wrapper },
 		);
+
 		await waitFor(() => expect(result.current.accounts.data).toEqual([]));
 		await act(() => result.current.sync.refresh());
 		await waitFor(() => expect(result.current.sync.transportError).toBe(true));

src/features/tbank-connection/model/screen-sync.ts

@@ -15,15 +15,21 @@ import { type InvestmentScreen, useTbankSync } from "./sync";
 
 type ResourceMeta
 	= paths["/api/v1/tbank-sync/{id}"]["get"]["responses"][200]["content"]["application/json"]["resources"][number];
+
 type ScreenResource = {
 	meta?: ResourceMeta;
 	observe: (version?: string) => Promise<unknown>;
 	queryKey: QueryKey;
 	transport: {
-		fetchStatus: "fetching" | "idle" | "paused";
-		status: "error" | "pending" | "success";
+		fetchStatus: "fetching"
+			| "idle"
+			| "paused";
+		status: "error"
+			| "pending"
+			| "success";
 	};
 };
+
 const STATUS_INTERVAL_MS = 1000;
 
 function observeResource(
@@ -38,27 +44,34 @@ function observeResource(
 		if (observed.get(key) === completedId) return;
 		observed.set(key, completedId);
 		void resource.observe().catch(() => {});
+
 		return;
 	}
+
 	const changed = [
 		resource.meta,
 		...(resource.meta.dependencies ?? []),
 	].flatMap((current) => {
 		const notified = latest.get(current.resourceKey);
+
 		return notified && notified.stateVersion !== current.stateVersion
 			? [notified]
 			: [];
 	});
+
 	if (changed.length === 0) return;
+
 	const notification = JSON.stringify(
 		changed.map(meta => [meta.resourceKey, meta.stateVersion]),
 	);
-	if (observed.get(resource.meta.resourceKey) === notification)
-		return;
+
+	if (observed.get(resource.meta.resourceKey) === notification) return;
 	observed.set(resource.meta.resourceKey, notification);
+
 	const own = changed.find(
 		meta => meta.resourceKey === resource.meta?.resourceKey,
 	);
+
 	void resource.observe(own?.stateVersion).catch(() => {});
 }
 
@@ -67,17 +80,24 @@ function useScreenSync(scope: InvestmentScreen, resources: ScreenResource[]) {
 	const client = useQueryClient();
 	const deniedRef = useRef(new Set<unknown>());
 	const scopeKey = JSON.stringify(scope);
-	const [requested, setRequested] = useState<null | {
-		id: string;
-		scope: string;
-	}>(null);
+
+	const [requested, setRequested] = useState<null
+		| {
+			id: string;
+			scope: string;
+		}>(null);
+
 	const requestInFlightRef = useRef<null | string>(null);
 	const currentScopeRef = useRef(scopeKey);
 	useLayoutEffect(() => {
 		currentScopeRef.current = scopeKey;
 	}, [scopeKey]);
-	const isCurrentMutation = JSON.stringify(mutation.variables?.body) === scopeKey;
+
+	const isCurrentMutation
+		= JSON.stringify(mutation.variables?.body) === scopeKey;
+
 	const observedRef = useRef(new Map<string, string>());
+
 	const ids = [
 		...new Set([
 			...(requested?.scope === scopeKey ? [requested.id] : []),
@@ -93,6 +113,7 @@ function useScreenSync(scope: InvestmentScreen, resources: ScreenResource[]) {
 				),
 		]),
 	];
+
 	const statuses = useAuthenticatedQueries(
 		ids.map(id => ({
 			...apiQueryClient.queryOptions("get", "/api/v1/tbank-sync/{id}", {
@@ -101,12 +122,16 @@ function useScreenSync(scope: InvestmentScreen, resources: ScreenResource[]) {
 			refetchInterval: (query: {
 				state: { data?: { state: string }; error: unknown };
 			}) =>
-				!(query.state.error || (query.state.data && query.state.data.state !== "running")) && STATUS_INTERVAL_MS,
+				!(
+					query.state.error
+					|| (query.state.data && query.state.data.state !== "running")
+				) && STATUS_INTERVAL_MS,
 			refetchOnMount: false,
 			refetchOnWindowFocus: false,
 			retry: false,
 		})),
 	);
+
 	useEffect(() => {
 		for (const status of statuses) {
 			if (!status.error || deniedRef.current.has(status.error)) {
@@ -117,10 +142,16 @@ function useScreenSync(scope: InvestmentScreen, resources: ScreenResource[]) {
 			if (!isApiErrorCode(apiErrorCode(status.error), ApiErrorCode.NotFound))
 				invalidateResourceAccess(client, "brokerage", status.error);
 		}
+
 		const latest = new Map<string, ResourceMeta>();
-		const orderedStatuses = statuses.toSorted((a, b) => a.dataUpdatedAt - b.dataUpdatedAt);
+
+		const orderedStatuses = statuses.toSorted(
+			(a, b) => a.dataUpdatedAt - b.dataUpdatedAt,
+		);
+
 		for (const status of orderedStatuses) {
 			const statusResources = status.data?.resources ?? [];
+
 			for (const meta of statusResources) {
 				latest.set(meta.resourceKey, meta);
 				const dependencies = meta.dependencies ?? [];
@@ -128,10 +159,18 @@ function useScreenSync(scope: InvestmentScreen, resources: ScreenResource[]) {
 					latest.set(dependency.resourceKey, dependency);
 			}
 		}
-		const completed = statuses.find(status => requested?.scope === scopeKey
-			&& status.data?.id === requested.id && status.data.state !== "running")?.data;
-		for (const resource of resources) observeResource(resource, latest, completed?.id, observedRef.current);
+
+		const completed = statuses.find(
+			status =>
+				requested?.scope === scopeKey
+				&& status.data?.id === requested.id
+				&& status.data.state !== "running",
+		)?.data;
+
+		for (const resource of resources)
+			observeResource(resource, latest, completed?.id, observedRef.current);
 	}, [client, statuses, resources, requested, scopeKey]);
+
 	const isRefreshing
 		= (isCurrentMutation && mutation.isPending)
 			|| statuses.some(
@@ -139,15 +178,18 @@ function useScreenSync(scope: InvestmentScreen, resources: ScreenResource[]) {
 			)
 			|| resources.some(({ meta }) => {
 				const status = statuses[ids.indexOf(meta?.sync.id ?? "")];
+
 				return (
 					!status?.isError
 					&& (!status?.data || status.data.state === "running")
 					&& (meta?.sync.state === "running" || meta?.sync.state === "queued")
 				);
 			});
+
 	const refresh = async () => {
 		if (isRefreshing || requestInFlightRef.current === scopeKey) return;
 		requestInFlightRef.current = scopeKey;
+
 		try {
 			const accepted = await mutation.mutateAsync({ body: scope });
 			if (
@@ -162,15 +204,20 @@ function useScreenSync(scope: InvestmentScreen, resources: ScreenResource[]) {
 			*/
 		}
 		finally {
-			if (requestInFlightRef.current === scopeKey) requestInFlightRef.current = /* eslint-disable-line unicorn/no-null -- Preserve the nullable domain value consumed by this view model. */ null;
+			if (requestInFlightRef.current === scopeKey)
+				requestInFlightRef.current
+					// eslint-disable-next-line unicorn/no-null -- Preserve the nullable domain value consumed by this view model.
+					= null;
 		}
 	};
+
 	// Retry failed HTTP reads without asking the source to import again.
 	// A source failure (or explicit refresh with no read error) still needs a sync.
 	const retry = async () => {
 		const failed = resources.filter(
 			resource => resource.transport.status === "error",
 		);
+
 		const failedStatuses = statuses.filter(status => status.isError);
 		if (failed.length > 0 || failedStatuses.length > 0) {
 			await Promise.allSettled([
@@ -180,6 +227,7 @@ function useScreenSync(scope: InvestmentScreen, resources: ScreenResource[]) {
 		}
 		else await refresh();
 	};
+
 	return {
 		refresh,
 		refreshing: isRefreshing,

src/features/tbank-connection/model/sync.test.tsx

@@ -25,25 +25,32 @@ describe("sync connection and session boundaries", () => {
 				refresh: () => Promise.resolve(true),
 			});
 
-			const { promise: blocked, resolve: release } = Promise.withResolvers<void>();
+			const { promise: blocked, resolve: release }
+				= Promise.withResolvers<void>();
+
 			const accepted = {
 				id: "work",
 				now: "2026-09-25T12:00:00Z",
 				scope: { screen: "accounts" },
 			};
+
 			let started = 0;
 			let isChanged = false;
 			server.use(
 				http.post("*/api/v1/tbank-sync", async () => {
 					started += 1;
 					await blocked;
+
 					return HttpResponse.json(accepted, { status: 202 });
 				}),
 				http.get("*/api/v1/tbank-sync/:id", async () => {
 					const now = isChanged ? "2026-09-25T12:01:00Z" : accepted.now;
 					started += 1;
 					await blocked;
-					return HttpResponse.json((/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+
+					/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+
+					return HttpResponse.json(
 						{
 							...accepted,
 							errorCode: null,
@@ -51,21 +58,26 @@ describe("sync connection and session boundaries", () => {
 							progress: { completed: 1, discovering: false, total: 1 },
 							resources: [],
 							state: "succeeded",
-						}
-						/* eslint-enable unicorn/no-null */));
+						},
+						/* eslint-enable unicorn/no-null */
+					);
 				}),
 			);
 			const { queryClient, wrapper } = createQueryWrapper();
 			const published: string[] = [];
+
 			const unsubscribe = queryClient.getQueryCache().subscribe((event) => {
-				if ((event.query.queryKey as readonly unknown[])[1]
-					!== "/api/v1/tbank-sync/{id}") {
+				if (
+					(event.query.queryKey as readonly unknown[])[1]
+					!== "/api/v1/tbank-sync/{id}"
+				) {
 					return;
 				}
 
 				const data = event.query.state.data as undefined | { now?: string };
 				if (data?.now) published.push(data.now);
 			});
+
 			const { result } = renderHook(
 				() => ({
 					mutation: useTbankSync(),
@@ -73,39 +85,49 @@ describe("sync connection and session boundaries", () => {
 				}),
 				{ wrapper },
 			);
+
 			const screen: InvestmentScreen = { screen: "accounts" };
 			let mutation!: Promise<unknown>;
 			act(() => {
 				mutation = result.current.mutation.mutateAsync({ body: screen });
 			});
+
 			// eslint-disable-next-line vitest/valid-expect -- Attach rejection handling before releasing the request; the assertion is awaited below.
 			const discarded = expect(mutation).rejects.toMatchObject({
 				name: "AbortError",
 			});
+
 			await waitFor(() => expect(started).toBe(2));
 			await act(async () => {
 				isChanged = true;
+
 				if (boundary === "connection")
-					commitTbankConnectionBoundary(queryClient, (/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+					commitTbankConnectionBoundary(
+						/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+						queryClient,
 						{
 							connected: false,
 							connectedAt: null,
-						}
-						/* eslint-enable unicorn/no-null */));
+						},
+						/* eslint-enable unicorn/no-null */
+					);
 				else {
 					generation += 1;
 					queryClient.clear();
 				}
+
 				release();
 				await blocked;
 			});
 			await discarded;
 			expect(result.current.mutation.data).toBeUndefined();
+
 			const key = apiQueryClient.queryOptions(
 				"get",
 				"/api/v1/tbank-sync/{id}",
 				{ params: { path: { id: "work" } } },
 			).queryKey;
+
 			// A new request may start after a successful connection boundary; an old result cannot win it.
 			if (boundary === "session")
 				// eslint-disable-next-line vitest/no-conditional-expect -- The fixed table case selects the expected outcome; every case asserts its own branch.

src/features/tbank-connection/model/sync.ts

@@ -6,11 +6,13 @@ import {
 
 type InvestmentScreen
 	= paths["/api/v1/tbank-sync"]["post"]["requestBody"]["content"]["application/json"];
+
 function useTbankSync() {
 	return apiQueryClient.useMutation("post", "/api/v1/tbank-sync", {
 		retry: false,
 	});
 }
+
 function useTbankSyncStatus(id: null | string) {
 	return useAuthenticatedQuery({
 		...apiQueryClient.queryOptions("get", "/api/v1/tbank-sync/{id}", {

src/features/tbank-connection/ui/TbankConnectionSection/TbankConnectionSection.test.tsx

@@ -21,26 +21,31 @@ const brokerageAccountsQueryKey = apiQueryClient.queryOptions(
 	"get",
 	"/api/v1/brokerage-accounts",
 ).queryKey;
+
 const portfolioQueryKey = apiQueryClient.queryOptions(
 	"get",
 	"/api/v1/brokerage-accounts/{accountId}/portfolio",
 	{ params: { path: { accountId: "account-1" } } },
 ).queryKey;
+
 const operationsQueryKey = apiQueryClient.queryOptions(
 	"get",
 	"/api/v1/brokerage-accounts/{accountId}/operations",
 	{ params: { path: { accountId: "account-1" } } },
 ).queryKey;
+
 const stockQueryKey = apiQueryClient.queryOptions(
 	"get",
 	"/api/v1/stocks/{uid}/position",
 	{ params: { path: { uid: "e6123145-9665-43e0-8413-cd61b8aa9b13" } } },
 ).queryKey;
+
 const bondQueryKey = apiQueryClient.queryOptions(
 	"get",
 	"/api/v1/bonds/{uid}/position",
 	{ params: { path: { uid: "e6123145-9665-43e0-8413-cd61b8aa9b13" } } },
 ).queryKey;
+
 const bankCardsQueryKey = apiQueryClient.queryOptions(
 	"get",
 	"/api/v1/bank-cards",
@@ -48,6 +53,7 @@ const bankCardsQueryKey = apiQueryClient.queryOptions(
 		params: { query: { includeArchived: "false" } },
 	},
 ).queryKey;
+
 const unrelatedQueryKey = apiQueryClient.queryOptions(
 	"get",
 	"/api/v1/auth/me",
@@ -59,6 +65,7 @@ function renderSection(client: QueryClient) {
 		clear: vi.fn(),
 		refresh: () => Promise.resolve(true),
 	});
+
 	return render(
 		<MantineProvider>
 			<QueryClientProvider client={client}>
@@ -70,21 +77,22 @@ function renderSection(client: QueryClient) {
 
 function seededClient() {
 	const client = createTestQueryClient();
+	/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
 	client.setQueryData(brokerageAccountsQueryKey, [
-		(/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
-			{
-				id: "account-1",
-				name: "Основной счет",
-				openedOn: null,
-				type: "BROKERAGE",
-			}
-		/* eslint-enable unicorn/no-null */),
+		{
+			id: "account-1",
+			name: "Основной счет",
+			openedOn: null,
+			type: "BROKERAGE",
+		},
+		/* eslint-enable unicorn/no-null */
 	]);
 	client.setQueryData(portfolioQueryKey, { source: "previous-connection" });
 	client.setQueryData(stockQueryKey, { source: "previous-connection" });
 	client.setQueryData(bondQueryKey, { source: "previous-connection" });
 	client.setQueryData(unrelatedQueryKey, { id: "user-1" });
 	client.setQueryData(bankCardsQueryKey, [{ id: "bank-card-1" }]);
+
 	return client;
 }
 
@@ -92,18 +100,23 @@ describe("TbankConnectionSection", () => {
 	it("preserves cached status and a draft entered during a delayed failed refetch", async () => {
 		const status = { connected: true, connectedAt: "2026-08-14T00:00:00Z" };
 
-		const { promise: response, resolve: finishRefetch } = Promise.withResolvers<void>();
+		const { promise: response, resolve: finishRefetch }
+			= Promise.withResolvers<void>();
+
 		let reads = 0;
 		server.use(
 			http.get("*/api/v1/tbank-connection", async () => {
 				reads += 1;
+
 				if (reads === 1) {
 					await response;
+
 					return HttpResponse.json(
 						{ code: "TBANK_UNAVAILABLE" },
 						{ status: 503 },
 					);
 				}
+
 				return HttpResponse.json(status);
 			}),
 		);
@@ -141,11 +154,14 @@ describe("TbankConnectionSection", () => {
 		server.use(
 			http.get("*/api/v1/tbank-connection", () => {
 				reads += 1;
+
 				return reads === 1
 					? HttpResponse.json({ code: "TBANK_UNAVAILABLE" }, { status: 503 })
-					: HttpResponse.json((/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
-							{ connected: false, connectedAt: null }
-							/* eslint-enable unicorn/no-null */));
+					/* eslint-disable unicorn/no-null -- Fixture preserves the production contract’s explicit null values. */
+					: HttpResponse.json(
+							{ connected: false, connectedAt: null },
+							/* eslint-enable unicorn/no-null */
+						);
 			}),
 		);
 		renderSection(createTestQueryClient());
@@ -244,19 +260,24 @@ describe("TbankConnectionSection", () => {
 		const client = seededClient();
 
 		let isAborted = false;
-		const { promise: previousResponse, resolve: finishPrevious } = Promise.withResolvers<{ source: string }>();
+
+		const { promise: previousResponse, resolve: finishPrevious }
+			= Promise.withResolvers<{ source: string }>();
+
 		const previousRequest = client
 			.query({
 				queryFn: ({ signal }) => {
 					signal.addEventListener("abort", () => {
 						isAborted = true;
 					});
+
 					return previousResponse;
 				},
 				queryKey: operationsQueryKey,
 			})
 			// eslint-disable-next-line unicorn/prefer-await -- Attach the handler immediately and retain the pending promise for queue/race ordering.
 			.catch(() => {});
+
 		renderSection(client);
 
 		await screen.findByText("Не подключено");
@@ -302,7 +323,9 @@ describe("TbankConnectionSection", () => {
 	it("keeps DELETE recovery inside the dialog and preserves cache until successful retry", async () => {
 		let deletes = 0;
 
-		const { promise: response, resolve: finishDelete } = Promise.withResolvers<void>();
+		const { promise: response, resolve: finishDelete }
+			= Promise.withResolvers<void>();
+
 		server.use(
 			http.get("*/api/v1/tbank-connection", () =>
 				HttpResponse.json({
@@ -313,6 +336,7 @@ describe("TbankConnectionSection", () => {
 			http.delete("*/api/v1/tbank-connection", async () => {
 				deletes += 1;
 				if (deletes === 1) await response;
+
 				return deletes === 1
 					? HttpResponse.json({ code: "TBANK_UNAVAILABLE" }, { status: 503 })
 					: new HttpResponse(null, { status: 204 });
@@ -324,9 +348,11 @@ describe("TbankConnectionSection", () => {
 		fireEvent.click(
 			await screen.findByRole("button", { name: "Удалить подключение" }),
 		);
+
 		const dialog = await screen.findByRole("dialog", {
 			name: "Удалить подключение?",
 		});
+
 		await waitFor(() =>
 			// eslint-disable-next-line testing-library/no-node-access -- This assertion checks DOM structure, decoration or focus behavior that semantic queries cannot establish.
 			expect(dialog.contains(document.activeElement)).toBe(true),

src/features/tbank-connection/ui/TbankConnectionSection/TbankConnectionSection.tsx

@@ -10,7 +10,14 @@ import { TbankConnectionSectionLoaded } from "./TbankConnectionSectionLoaded";
 const TbankConnectionSection: FC = () => {
 	const viewModel = useTbankConnectionViewModel();
 	if (viewModel.state === "loading") return <TbankConnectionLoading />;
-	return viewModel.state === "error" ? <TbankConnectionError retry={viewModel.retry} /> : <TbankConnectionSectionLoaded {...viewModel} />;
+
+	return viewModel.state === "error"
+		? (
+				<TbankConnectionError retry={viewModel.retry} />
+			)
+		: (
+				<TbankConnectionSectionLoaded {...viewModel} />
+			);
 };
 
 export { TbankConnectionSection };

src/features/tbank-connection/ui/TbankConnectionSection/TbankConnectionSection.view.test.tsx

@@ -10,11 +10,13 @@ import {
 describe("TbankConnectionSection state views", () => {
 	it("renders loading and retries a status error", () => {
 		const retry = vi.fn();
+
 		const { rerender } = render(
 			<MantineProvider>
 				<TbankConnectionLoading />
 			</MantineProvider>,
 		);
+
 		expect(screen.getByRole("status", { name: "Загрузка" })).toHaveAttribute(
 			"aria-busy",
 			"true",

src/features/tbank-connection/ui/TbankConnectionSection/TbankConnectionSection.view.tsx

@@ -14,6 +14,7 @@ const TbankConnectionLoading: FC = () => {
 	return (
 		<LoadingSkeleton label={t("states.loadingTitle")}>
 			<Skeleton height={20} width="45%" />
+
 			<Skeleton height={36} radius="sm" width={140} />
 		</LoadingSkeleton>
 	);

src/features/tbank-connection/ui/TbankConnectionSection/TbankConnectionSection.vm.ts

@@ -6,9 +6,13 @@ function useTbankConnectionViewModel() {
 	const status = useAuthenticatedQuery({
 		...tbankConnectionQueryOptions(),
 	});
+
 	if (!status.data) {
-		return status.isPending ? { state: "loading" as const } : { retry: () => status.refetch(), state: "error" as const };
+		return status.isPending
+			? { state: "loading" as const }
+			: { retry: () => status.refetch(), state: "error" as const };
 	}
+
 	return {
 		refreshError: status.isError,
 		refreshing: status.isFetching,

src/features/tbank-connection/ui/TbankConnectionSection/TbankConnectionSectionLoaded.tsx

@@ -8,19 +8,11 @@ import {
 	Stack,
 	Text,
 } from "@mantine/core";
-import { useQueryClient } from "@tanstack/react-query";
-import { useEffect, useRef, useState } from "react";
-import { useForm } from "react-hook-form";
-import { useTranslation } from "react-i18next";
 
-import { ApiErrorCode, apiErrorCode, apiQueryClient, isApiErrorCode } from "@/shared/api";
+import { ApiErrorCode, isApiErrorCode } from "@/shared/api";
 
-import {
-	commitTbankConnectionBoundary,
-	type TbankConnectionStatus,
-} from "../../model/connection-boundary";
-
-enum ConnectionErrorCode { RequestFailed = "REQUEST_ERROR" }
+import { type TbankConnectionStatus } from "../../model/connection-boundary";
+import { useTbankConnectionSectionLoadedVm } from "./TbankConnectionSectionLoaded.vm";
 
 type TbankConnectionSectionLoadedProps = {
 	refreshError: boolean;
@@ -32,48 +24,29 @@ type TbankConnectionSectionLoadedProps = {
 const TbankConnectionSectionLoaded: FC<TbankConnectionSectionLoadedProps> = (
 	props,
 ) => {
-	const { status } = props;
-	const { t } = useTranslation();
-	const queryClient = useQueryClient();
-	const [isDeleteOpened, setIsDeleteOpened] = useState(false);
-	const removalButtonRef = useRef<HTMLButtonElement>(null);
-	const [requestError, setRequestError] = useState<null | string>(null);
 	const {
-		formState: { errors },
-		handleSubmit,
+		errors,
+		isConnected,
+		isDeleteOpened,
+		isPending,
+		onCloseDisconnect,
+		onConfirmDisconnect,
+		onOpenDisconnect,
+		onSubmit,
 		register,
-		reset,
-	} = useForm<{ token: string }>();
-	const update = apiQueryClient.useMutation("put", "/api/v1/tbank-connection", {
-		onError: error => setRequestError(apiErrorCode(error) ?? ConnectionErrorCode.RequestFailed),
-		onSuccess: (data) => {
-			commitTbankConnectionBoundary(queryClient, data);
-			reset();
-		},
-	});
-	const remove = apiQueryClient.useMutation(
-		"delete",
-		"/api/v1/tbank-connection",
-		{
-			onSuccess: () => {
-				commitTbankConnectionBoundary(queryClient, {
-					connected: false,
-					connectedAt: /* eslint-disable-line unicorn/no-null -- The disconnected API snapshot requires a null connection timestamp. */ null,
-				});
-				setIsDeleteOpened(false);
-			},
-		},
-	);
-	const unavailableMessage = isApiErrorCode(requestError, ApiErrorCode.TbankUnavailable) ? "tbank.unavailable" : "tbank.requestError";
-	const isPending = update.isPending || remove.isPending;
-	const isConnected = status.connected;
-	useEffect(() => {
-		if (isDeleteOpened && remove.isError) removalButtonRef.current?.focus();
-	}, [isDeleteOpened, remove.isError]);
+		removalButtonRef,
+		remove,
+		requestError,
+		status,
+		t,
+		unavailableMessage,
+		update,
+	} = useTbankConnectionSectionLoadedVm(props);
 
 	return (
 		<Stack mt="xl">
 			<Text fw={600}>{t("tbank.title")}</Text>
+
 			<Text size="sm">
 				{isConnected
 					? t("tbank.connected", {
@@ -83,18 +56,22 @@ const TbankConnectionSectionLoaded: FC<TbankConnectionSectionLoadedProps> = (
 						})
 					: t("tbank.disconnected")}
 			</Text>
+
 			<Text c="dimmed" size="sm">
 				{t("tbank.hint")}
 			</Text>
+
 			{props.refreshing && (
 				<Text c="dimmed" role="status" size="sm">
 					{t("tbank.refreshing")}
 				</Text>
 			)}
+
 			{props.refreshError && (
 				<Alert aria-live="polite" color="orange" role="status">
 					<Stack gap="sm">
 						<Text>{t("tbank.refreshError")}</Text>
+
 						<Button
 							disabled={props.refreshing || isPending}
 							onClick={props.retry}
@@ -105,12 +82,8 @@ const TbankConnectionSectionLoaded: FC<TbankConnectionSectionLoadedProps> = (
 					</Stack>
 				</Alert>
 			)}
-			<form
-				onSubmit={handleSubmit(({ token }) => {
-					setRequestError(null);
-					update.mutate({ body: { token } });
-				})}
-			>
+
+			<form onSubmit={onSubmit}>
 				<fieldset disabled={isPending}>
 					<Stack>
 						<PasswordInput
@@ -118,6 +91,7 @@ const TbankConnectionSectionLoaded: FC<TbankConnectionSectionLoadedProps> = (
 							{...register("token", { required: t("tbank.tokenRequired") })}
 							error={errors.token?.message}
 						/>
+
 						{requestError && (
 							<Alert color="red">
 								{t(
@@ -127,42 +101,43 @@ const TbankConnectionSectionLoaded: FC<TbankConnectionSectionLoadedProps> = (
 								)}
 							</Alert>
 						)}
+
 						<Button loading={update.isPending} type="submit">
 							{t(isConnected ? "tbank.replace" : "tbank.connect")}
 						</Button>
+
 						{isConnected && (
-							<Button
-								color="red"
-								onClick={() => {
-									remove.reset();
-									setIsDeleteOpened(true);
-								}}
-								variant="outline"
-							>
+							<Button color="red" onClick={onOpenDisconnect} variant="outline">
 								{t("tbank.delete")}
 							</Button>
 						)}
 					</Stack>
 				</fieldset>
 			</form>
+
 			<Modal
-				closeButtonProps={{ "aria-label": t("tbank.close"), "disabled": isPending }}
+				closeButtonProps={{
+					"aria-label": t("tbank.close"),
+					"disabled": isPending,
+				}}
 				closeOnClickOutside={!isPending}
 				closeOnEscape={!isPending}
-				onClose={() => !isPending && setIsDeleteOpened(false)}
+				onClose={onCloseDisconnect}
 				opened={isDeleteOpened}
 				title={t("tbank.deleteTitle")}
 			>
 				<Stack>
 					<Text>{t("tbank.deleteText")}</Text>
+
 					{remove.isError && (
 						<Alert color="red">{t("tbank.requestError")}</Alert>
 					)}
+
 					<Button
 						color="red"
 						disabled={isPending}
 						loading={remove.isPending}
-						onClick={() => remove.mutate({})}
+						onClick={onConfirmDisconnect}
 						ref={removalButtonRef}
 					>
 						{t("tbank.deleteConfirm")}

src/features/tbank-connection/ui/TbankConnectionSection/TbankConnectionSectionLoaded.vm.ts

@@ -0,0 +1,116 @@
+import { useQueryClient } from "@tanstack/react-query";
+import { useEffect, useRef, useState } from "react";
+import { useForm } from "react-hook-form";
+import { useTranslation } from "react-i18next";
+
+import {
+	ApiErrorCode,
+	apiErrorCode,
+	apiQueryClient,
+	isApiErrorCode,
+} from "@/shared/api";
+
+import {
+	commitTbankConnectionBoundary,
+	type TbankConnectionStatus,
+} from "../../model/connection-boundary";
+enum ConnectionErrorCode {
+	RequestFailed = "REQUEST_ERROR",
+}
+
+type TbankConnectionSectionLoadedProps = {
+	refreshError: boolean;
+	refreshing: boolean;
+	retry: () => void;
+	status: TbankConnectionStatus;
+};
+
+function useTbankConnectionSectionLoadedVm(
+	props: TbankConnectionSectionLoadedProps,
+) {
+	const { status } = props;
+	const { t } = useTranslation();
+	const queryClient = useQueryClient();
+	const [isDeleteOpened, setIsDeleteOpened] = useState(false);
+	const removalButtonRef = useRef<HTMLButtonElement>(null);
+	const [requestError, setRequestError] = useState<null | string>(null);
+
+	const {
+		formState: { errors },
+		handleSubmit,
+		register,
+		reset,
+	} = useForm<{ token: string }>();
+
+	const update = apiQueryClient.useMutation("put", "/api/v1/tbank-connection", {
+		onError: error =>
+			setRequestError(apiErrorCode(error) ?? ConnectionErrorCode.RequestFailed),
+		onSuccess: (data) => {
+			commitTbankConnectionBoundary(queryClient, data);
+			reset();
+		},
+	});
+
+	const remove = apiQueryClient.useMutation(
+		"delete",
+		"/api/v1/tbank-connection",
+		{
+			onSuccess: () => {
+				commitTbankConnectionBoundary(queryClient, {
+					connected: false,
+					connectedAt:
+						// eslint-disable-next-line unicorn/no-null -- The disconnected API snapshot requires a null connection timestamp.
+						null,
+				});
+				setIsDeleteOpened(false);
+			},
+		},
+	);
+
+	const unavailableMessage = isApiErrorCode(
+		requestError,
+		ApiErrorCode.TbankUnavailable,
+	)
+		? "tbank.unavailable"
+		: "tbank.requestError";
+
+	const isPending = update.isPending || remove.isPending;
+	const isConnected = status.connected;
+	useEffect(() => {
+		if (isDeleteOpened && remove.isError) removalButtonRef.current?.focus();
+	}, [isDeleteOpened, remove.isError]);
+
+	const onSubmit = handleSubmit(({ token }) => {
+		setRequestError(null);
+		update.mutate({ body: { token } });
+	});
+
+	const onOpenDisconnect = () => {
+		remove.reset();
+		setIsDeleteOpened(true);
+	};
+
+	const onCloseDisconnect = () => !isPending && setIsDeleteOpened(false);
+	const onConfirmDisconnect = () => remove.mutate({});
+
+	return {
+		errors,
+		isConnected,
+		isDeleteOpened,
+		isPending,
+		onCloseDisconnect,
+		onConfirmDisconnect,
+		onOpenDisconnect,
+		onSubmit,
+		register,
+		removalButtonRef,
+		remove,
+		requestError,
+		status,
+		t,
+		unavailableMessage,
+		update,
+	};
+}
+
+export { useTbankConnectionSectionLoadedVm };