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/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>
 	);
 };