AthleteView: listen for bincio:me event so owner tabs appear without hard refresh

In multi-user instances /api/me is async and usually hasn't returned by the
time onMount runs, leaving isOwner=false. Subscribe to the bincio:me event
(fired by Base.astro when /api/me resolves) so the reactive TABS filter
re-evaluates and Explore / Nerd Corner appear without needing Cmd+Shift+R.

site/src/components/AthleteView.svelte

@@ -84,7 +84,16 @@
   }
 
   onMount(async () => {
-    isOwner = (window as any).__bincioMe === handle;
+    const w = window as any;
+    if (w.__bincioMe !== undefined) {
+      isOwner = w.__bincioMe === handle;
+    } else {
+      // Multi-user: __bincioMe is set asynchronously by /api/me in Base.astro.
+      // Listen for the event so owner-only tabs appear without a hard refresh.
+      window.addEventListener('bincio:me', (e: Event) => {
+        isOwner = (e as CustomEvent<string>).detail === handle;
+      }, { once: true });
+    }
     const TABS: Tab[] = ['power', 'records', 'segments', 'profile', 'explore', 'nerd'];
     const rawTab = new URLSearchParams(window.location.search).get('tab');
     const resolved = TABS.includes(rawTab as Tab) ? (rawTab as Tab) : 'power';