fix: show total activity count in global feed counter

The counter now shows "50 of 16398 activities" using the total from
feed.json, matching the previous behaviour where all activities were
loaded upfront.

site/src/components/ActivityFeed.svelte

@@ -48,6 +48,8 @@
   /** Remaining combined-feed pages (multi-user global feed). */
   let feedNextPage = 0;
   let feedTotalPages = 0;
+  /** Grand total from feed.json — shows instance-wide count even before all pages are loaded. */
+  let totalActivities = 0;
   /** Logged-in handle — resolved async via bincio:me event. */
   let me: string = '';
 
@@ -123,6 +125,7 @@
         const combined = await loadCombinedFeed(base);
         if (combined) {
           all = combined.activities;
+          totalActivities = combined.totalActivities;
           feedTotalPages = combined.remainingPages + 1;
           feedNextPage = combined.remainingPages > 0 ? 2 : 0;
           loading = false;
@@ -175,7 +178,11 @@
   {/each}
   {#if all.length > 0}
     <span class="ml-auto text-sm text-zinc-500 self-center">
+      {#if totalActivities > filtered.length}
+        {filtered.length} of {totalActivities} activities
+      {:else}
         {filtered.length} {filtered.length === 1 ? 'activity' : 'activities'}
+      {/if}
     </span>
   {/if}
 </div>

site/src/lib/dataloader.ts

@@ -269,12 +269,13 @@ interface FeedPage {
  */
 export async function loadCombinedFeed(
   baseUrl: string,
-): Promise<{ activities: ActivitySummary[]; remainingPages: number } | null> {
+): Promise<{ activities: ActivitySummary[]; remainingPages: number; totalActivities: number } | null> {
   try {
     const feed = await fetchJSON<FeedPage>(`${baseUrl}data/feed.json`);
     return {
       activities: feed.activities ?? [],
       remainingPages: (feed.total_pages ?? 1) - 1,
+      totalActivities: feed.total_activities ?? 0,
     };
   } catch {
     return null;