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/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 };