feat: configure-tap action navigates to AppConfig page

The tap button in the node toolbar now navigates to
/admin/appconfig?app=<application>&processor=<nodeId>, which
auto-selects the application in the AppConfigPage. The AppConfigPage
reads the ?app query param to open the detail panel for that app.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/pages/ExchangeDetail/ExchangeDetail.tsx

@@ -243,8 +243,10 @@ export default function ExchangeDetail() {
   const handleNodeAction = useCallback((nodeId: string, action: NodeAction) => {
     if (action === 'toggle-trace') {
       handleToggleTracing(nodeId)
+    } else if (action === 'configure-tap' && detail?.applicationName) {
+      navigate(`/admin/appconfig?app=${encodeURIComponent(detail.applicationName)}&processor=${encodeURIComponent(nodeId)}`)
     }
-  }, [handleToggleTracing])
+  }, [handleToggleTracing, detail?.applicationName, navigate])
 
   // ── Replay ─────────────────────────────────────────────────────────────
   const { data: liveAgents } = useAgents('LIVE', detail?.applicationName)