데모용 임시 회원가입 구현

src/routes/(fullscreen)/auth/login/NicknameModal.svelte

@@ -0,0 +1,18 @@
+<script lang="ts">
+  import { TextInputModal } from "$lib/components/organisms";
+
+  interface Props {
+    isOpen: boolean;
+    onSubmitClick: (nickname: string) => void;
+  }
+
+  let { isOpen = $bindable(), onSubmitClick }: Props = $props();
+</script>
+
+<TextInputModal
+  bind:isOpen
+  title="닉네임 설정하기"
+  placeholder="닉네임"
+  submitText="새 계정 만들기"
+  {onSubmitClick}
+/>