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/pages/register/ui/RegisterPage.tsx

@@ -1,6 +1,8 @@
-import { useDocumentTitle } from "@mantine/hooks";
 import type { FC } from "react";
+
+import { useDocumentTitle } from "@mantine/hooks";
 import { useTranslation } from "react-i18next";
+
 import { AuthPageLayout, RegisterForm } from "@/features/auth";
 
 const RegisterPage: FC = () => {