fix low level issues

site/src/components/StatsView.svelte

@@ -9,6 +9,7 @@
   let sport: Sport | 'all' = 'all';
   let page = 0;
   let loading = true;
+  let error = '';
   let theme = 'dark';
   let mounted = false;
 
@@ -28,9 +29,14 @@
     sport = (params.get('sport') as Sport | 'all') ?? 'all';
     page  = parseInt(params.get('page') ?? '0', 10) || 0;
     mounted = true;
-    const res = await fetch(`${import.meta.env.BASE_URL}data/index.json`);
-    const index: BASIndex = await res.json();
-    all = index.activities.filter(a => a.privacy !== 'private' && a.distance_m);
+    try {
+      const res = await fetch(`${import.meta.env.BASE_URL}data/index.json`);
+      if (!res.ok) throw new Error(`HTTP ${res.status}`);
+      const index: BASIndex = await res.json();
+      all = index.activities.filter(a => a.privacy !== 'private' && a.distance_m);
+    } catch (e: any) {
+      error = e.message;
+    }
     loading = false;
 
     theme = document.documentElement.getAttribute('data-theme') ?? 'dark';
@@ -282,6 +288,8 @@
 
 {#if loading}
   <div class="h-64 rounded-xl bg-zinc-800 animate-pulse mb-6"></div>
+{:else if error}
+  <p class="text-red-400 text-sm mt-4">{error}</p>
 {:else}
 
 <!-- Pagination controls -->