Added loading page — SSE-driven splash screen for first-run UX

dashboard/public/jarvis.html

@@ -1058,14 +1058,8 @@ document.addEventListener('DOMContentLoaded', () => {
       .then(r => r.json())
       .then(data => { D = data; init(); connectSSE(); })
       .catch(() => {
-        // API not ready yet — use inline data as fallback if available
-        if (D && D.meta) { init(); }
-        else { document.getElementById('bootLines').innerHTML = '<div style="color:var(--warn)">Waiting for first sweep...</div>'; }
-        // Retry after a delay
-        setTimeout(() => {
-          fetch('/api/data').then(r => r.json()).then(data => { D = data; init(); connectSSE(); }).catch(() => {});
-        }, 10000);
-        connectSSE();
+        // Should not reach here — server routes to loading.html when no data
+        if (D && D.meta) { init(); connectSSE(); }
       });
   } else if (D && D.meta) {
     // File mode: use inline data