refactor: refactor foundation

src/pages/not-found/index.ts

@@ -1,6 +1 @@
-export {
-	NotFoundPage,
-	NotFoundPageEmpty,
-	NotFoundPageError,
-	NotFoundPageLoading,
-} from "./ui/NotFoundPage";
+export { NotFoundPage } from "./ui/NotFoundPage";

src/pages/not-found/ui/NotFoundPage.tsx

@@ -1,7 +1,7 @@
 import { Stack, Title } from "@mantine/core";
 import { useTranslation } from "react-i18next";
 import { Link } from "react-router";
-import { Button, StateView } from "../../../shared/ui/StateView";
+import { Button, StateView } from "@/shared/ui";
 
 export function NotFoundPage() {
 	const { t } = useTranslation();
@@ -13,29 +13,7 @@ export function NotFoundPage() {
 	);
 }
 
-export function NotFoundPageLoading() {
-	const { t } = useTranslation();
-	return (
-		<StateView
-			loading
-			title={t("states.loadingTitle")}
-			text={t("states.loadingText")}
-		/>
-	);
-}
-
-export function NotFoundPageError() {
-	const { t } = useTranslation();
-	return (
-		<StateView
-			error
-			title={t("states.errorTitle")}
-			text={t("states.errorText")}
-		/>
-	);
-}
-
-export function NotFoundPageEmpty() {
+function NotFoundPageEmpty() {
 	const { t } = useTranslation();
 	return (
 		<StateView