feat(ui): show process diagram when route is selected in sidebar

ui/src/pages/Exchanges/ExchangesPage.tsx

@@ -1,5 +1,5 @@
 import { useState, useMemo, useCallback, useRef, useEffect } from 'react';
-import { useNavigate, useLocation } from 'react-router';
+import { useNavigate, useLocation, useParams } from 'react-router';
 import { useGlobalFilters } from '@cameleer/design-system';
 import { useExecutionDetail } from '../../api/queries/executions';
 import { useDiagramByRoute } from '../../api/queries/diagrams';
@@ -16,6 +16,7 @@ import type { SelectedExchange } from '../Dashboard/Dashboard';
 export default function ExchangesPage() {
   const navigate = useNavigate();
   const location = useLocation();
+  const { appId: scopedAppId, routeId: scopedRouteId } = useParams<{ appId?: string; routeId?: string }>();
 
   // Restore selection from browser history state (enables Back/Forward)
   const stateSelected = (location.state as any)?.selectedExchange as SelectedExchange | undefined;
@@ -70,12 +71,18 @@ export default function ExchangesPage() {
     document.addEventListener('pointerup', onUp);
   }, []);
 
-  // No exchange selected: full-width Dashboard
-  if (!selected) {
+  // Show split view when a route is scoped (sidebar) or an exchange is selected
+  const showSplit = !!selected || !!scopedRouteId;
+
+  if (!showSplit) {
     return <Dashboard onExchangeSelect={handleExchangeSelect} />;
   }
 
-  // Exchange selected: resizable split — Dashboard on left, diagram on right
+  // Determine what the right panel shows
+  const panelAppId = selected?.applicationName ?? scopedAppId!;
+  const panelRouteId = selected?.routeId ?? scopedRouteId!;
+  const panelExchangeId = selected?.executionId ?? undefined;
+
   return (
     <div ref={containerRef} className={styles.splitView}>
       <div className={styles.leftPanel} style={{ width: `${splitPercent}%` }}>
@@ -84,9 +91,9 @@ export default function ExchangesPage() {
       <div className={styles.splitter} onPointerDown={handleSplitterDown} />
       <div className={styles.rightPanel} style={{ width: `${100 - splitPercent}%` }}>
         <DiagramPanel
-          appId={selected.applicationName}
-          routeId={selected.routeId}
-          exchangeId={selected.executionId}
+          appId={panelAppId}
+          routeId={panelRouteId}
+          exchangeId={panelExchangeId}
           onCorrelatedSelect={handleCorrelatedSelect}
           onClearSelection={handleClearSelection}
         />
@@ -100,7 +107,7 @@ export default function ExchangesPage() {
 interface DiagramPanelProps {
   appId: string;
   routeId: string;
-  exchangeId: string;
+  exchangeId?: string;
   onCorrelatedSelect: (executionId: string, applicationName: string, routeId: string) => void;
   onClearSelection: () => void;
 }
@@ -111,7 +118,8 @@ function DiagramPanel({ appId, routeId, exchangeId, onCorrelatedSelect, onClearS
   const timeFrom = timeRange.start.toISOString();
   const timeTo = timeRange.end.toISOString();
 
-  const { data: detail } = useExecutionDetail(exchangeId);
+  const { data: detail } = useExecutionDetail(exchangeId ?? null);
+  const diagramQuery = useDiagramByRoute(appId, routeId);
 
   const { data: catalog } = useRouteCatalog(timeFrom, timeTo);
   const knownRouteIds = useMemo(() => {
@@ -132,7 +140,8 @@ function DiagramPanel({ appId, routeId, exchangeId, onCorrelatedSelect, onClearS
     }
   }, [appId, navigate]);
 
-  if (detail) {
+  // Exchange selected: show header + execution diagram
+  if (exchangeId && detail) {
     return (
       <>
         <ExchangeHeader detail={detail} onCorrelatedSelect={onCorrelatedSelect} onClearSelection={onClearSelection} />
@@ -146,9 +155,22 @@ function DiagramPanel({ appId, routeId, exchangeId, onCorrelatedSelect, onClearS
     );
   }
 
+  // No exchange selected: show topology-only diagram
+  if (diagramQuery.data) {
+    return (
+      <ProcessDiagram
+        application={appId}
+        routeId={routeId}
+        diagramLayout={diagramQuery.data}
+        knownRouteIds={knownRouteIds}
+        onNodeAction={handleNodeAction}
+      />
+    );
+  }
+
   return (
     <div className={styles.emptyRight}>
-      Loading execution...
+      Loading diagram...
     </div>
   );
 }