feat: auto sign-in when creating the initial user (#2664)

* feat: auto sign-in on init user

apps/nextjs/src/app/[locale]/init/_steps/user/init-user-form.tsx

@@ -4,6 +4,7 @@ import { Button, PasswordInput, Stack, TextInput } from "@mantine/core";
 import type { z } from "zod";
 
 import { clientApi } from "@homarr/api/client";
+import { signIn } from "@homarr/auth/client";
 import { revalidatePathActionAsync } from "@homarr/common/client";
 import { useZodForm } from "@homarr/form";
 import { showErrorNotification, showSuccessNotification } from "@homarr/notifications";
@@ -30,6 +31,13 @@ export const InitUserForm = () => {
           title: tUser("notification.success.title"),
           message: tUser("notification.success.message"),
         });
+
+        await signIn("credentials", {
+          name: values.username,
+          password: values.password,
+          redirect: false,
+        });
+
         await revalidatePathActionAsync("/init");
       },
       onError: (error) => {