refactor: enhance character data transformation and improve fetching logic in character-related scripts

src/routes/(admin)/admin/character-changes/+page.svelte

@@ -1,6 +1,4 @@
 <script lang="ts">
-	import { page } from '$app/stores';
-
 	let { data, form } = $props();
 
 	const newCharacters = $derived(data.changes.filter((c: any) => c.type === 'new'));