refactor: use Mantine Breadcrumbs for app navigation

src/app/styles.css

@@ -32,15 +32,10 @@ a {
 .bottom-nav {
 	display: none;
 }
-.breadcrumbs {
-	display: flex;
-	gap: 0.5rem;
+[data-depth] {
 	margin-bottom: 1rem;
 }
-.breadcrumbs-entry {
-	display: contents;
-}
-.breadcrumbs a {
+[data-depth] a {
 	color: var(--ft-color-accent);
 }
 .auth-page {
@@ -75,8 +70,7 @@ a {
 		color: var(--ft-color-accent);
 		font-weight: 600;
 	}
-	.breadcrumbs[data-depth="3"] .breadcrumbs-item-0,
-	.breadcrumbs[data-depth="3"] .breadcrumbs-separator-1 {
+	[data-depth="3"] > :nth-child(-n + 2) {
 		display: none;
 	}
 	.mantine-AppShell-main {

src/app/ui/AppBreadcrumbs.test.tsx

@@ -1,3 +1,4 @@
+import { MantineProvider } from "@mantine/core";
 import { cleanup, render, screen } from "@testing-library/react";
 import { MemoryRouter } from "react-router";
 import { afterEach, describe, expect, it, vi } from "vitest";
@@ -15,9 +16,11 @@ function renderBreadcrumbs(
 ) {
 	useBrokerageAccounts.mockReturnValue({ data: accounts });
 	return render(
-		<MemoryRouter initialEntries={[path]}>
-			<AppBreadcrumbs />
-		</MemoryRouter>,
+		<MantineProvider>
+			<MemoryRouter initialEntries={[path]}>
+				<AppBreadcrumbs />
+			</MemoryRouter>
+		</MantineProvider>,
 	);
 }
 
@@ -67,6 +70,9 @@ describe("AppBreadcrumbs", () => {
 			"page",
 		);
 		expect(screen.getByRole("navigation")).toHaveAttribute("data-depth", "3");
+		for (const separator of screen.getAllByText("→")) {
+			expect(separator).toHaveAttribute("aria-hidden", "true");
+		}
 	});
 
 	it("uses the account fallback without exposing the identifier", () => {

src/app/ui/AppBreadcrumbs.tsx

@@ -1,3 +1,4 @@
+import { Breadcrumbs } from "@mantine/core";
 import type { FC } from "react";
 import { useTranslation } from "react-i18next";
 import { Link, useMatch } from "react-router";
@@ -20,31 +21,24 @@ const BreadcrumbTrail: FC<BreadcrumbTrailProps> = (props) => {
 	const { t } = useTranslation();
 
 	return (
-		<nav
+		<Breadcrumbs
 			aria-label={t("breadcrumbs.label")}
-			className="breadcrumbs"
+			component="nav"
 			data-depth={items.length}
+			separator={<span aria-hidden="true">→</span>}
 		>
-			{items.map((item, index) => (
-				<span className="breadcrumbs-entry" key={item.to ?? item.label}>
-					{index ? (
-						<span
-							aria-hidden="true"
-							className={`breadcrumbs-separator-${index}`}
-						>
-							→
-						</span>
-					) : null}
-					<span className={`breadcrumbs-item-${index}`}>
-						{item.to ? (
-							<Link to={item.to}>{item.label}</Link>
-						) : (
-							<span aria-current="page">{item.label}</span>
-						)}
+			{items.map((item) =>
+				item.to ? (
+					<Link key={item.to} to={item.to}>
+						{item.label}
+					</Link>
+				) : (
+					<span aria-current="page" key={item.label}>
+						{item.label}
 					</span>
-				</span>
-			))}
-		</nav>
+				),
+			)}
+		</Breadcrumbs>
 	);
 };