feat: add all-accounts portfolio pages

Reuse account sections and group securities with per-account holdings.

Use Mantine Select to preserve filters and reset pagination on scope changes.

Document component reuse guardrails and cover routes, grouping and scope switching.

src/pages/account-income/ui/AccountIncomePage.vm.ts

@@ -58,8 +58,11 @@ const incomeFormSchema = z.object({ from: draftDate, to: draftDate }).refine(
 	{ path: ["to"], ...validationMessage("income.validation.period")({}) },
 );
 
-const useAccountIncomePageViewModel = (): AccountIncomePageViewModel => {
-	const { accountId } = useParams();
+const useAccountIncomePageViewModel = (
+	scopeId?: string,
+): AccountIncomePageViewModel => {
+	const { accountId: routeAccountId } = useParams();
+	const accountId = scopeId ?? routeAccountId;
 	const [searchParams, setSearchParams] = useSearchParams();
 	const requested = useMemo(
 		() => ({