avoid multimodel update loop

src/routes/weather/compare/[location]/+page.svelte

@@ -1,5 +1,5 @@
 <script lang="ts">
-	import { onDestroy, onMount } from 'svelte';
+	import { onDestroy, onMount, untrack } from 'svelte';
 	import { get } from 'svelte/store';
 	import { fade } from 'svelte/transition';
 
@@ -239,8 +239,9 @@
 			return;
 		}
 
-		loading = fetchedData === null;
-		refreshing = fetchedData !== null;
+		const hasFetchedData = untrack(() => fetchedData !== null);
+		loading = !hasFetchedData;
+		refreshing = hasFetchedData;
 		loadError = null;
 		const timer = window.setTimeout(() => {
 			const controller = new AbortController();