Default observer reports to active round instead of first round

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/(observer)/observer/reports/page.tsx

@@ -590,10 +590,11 @@ export default function ObserverReportsPage() {
     }))
   ) || []
 
-  // Set default selected stage
+  // Set default selected stage — prefer the active round, fall back to first
   useEffect(() => {
     if (stages.length && !selectedValue) {
-      setSelectedValue(stages[0].id)
+      const active = stages.find((s) => s.status === 'ROUND_ACTIVE')
+      setSelectedValue(active ? active.id : stages[0].id)
     }
   }, [stages.length, selectedValue])