refactor: remove realtime visitors detail page

Remove the individual session journey page and make the live visitor
count a static indicator. Prepares for the new aggregated User Journeys
feature (v0.17).

app/sites/[id]/page.tsx

@@ -451,9 +451,8 @@ export default function SiteDashboardPage() {
             </div>
 
             {/* Realtime Indicator */}
-            <button
-              onClick={() => router.push(`/sites/${siteId}/realtime`)}
-              className="flex items-center gap-2 px-3 py-1 bg-green-500/10 rounded-full border border-green-500/20 hover:bg-green-500/20 transition-colors cursor-pointer"
+            <div
+              className="flex items-center gap-2 px-3 py-1 bg-green-500/10 rounded-full border border-green-500/20"
             >
               <span className="relative flex h-2 w-2">
                 <span className="animate-ping absolute inline-flex h-full w-full rounded-full bg-green-500 opacity-75"></span>
@@ -462,7 +461,7 @@ export default function SiteDashboardPage() {
               <span className="text-sm font-medium text-green-700 dark:text-green-400">
                 {realtime} current visitors
               </span>
-            </button>
+            </div>
           </div>
 
             <div className="flex items-center gap-2">