local conversion

site/src/components/ActivityDetail.svelte

@@ -7,6 +7,7 @@
   import ActivityMap from './ActivityMap.svelte';
   import ActivityCharts from './ActivityCharts.svelte';
   import EditDrawer from './EditDrawer.svelte';
+  import { loadActivity } from '../lib/dataloader';
 
   export let activity: ActivitySummary;
   export let base: string = '/';
@@ -28,9 +29,8 @@
   onMount(async () => {
     if (!activity.detail_url) return;
     try {
-      const res = await fetch(`${base}data/${activity.detail_url}`);
-      if (!res.ok) throw new Error(`HTTP ${res.status}`);
-      detail = await res.json();
+      detail = await loadActivity(activity.id, activity.detail_url, base);
+      if (!detail) throw new Error('Activity not found');
     } catch (e: any) {
       error = e.message;
     }