feat(ui): redesign ExchangeHeader with info bar, arrows, and navigation

- Always shows exchange info row: status dot, badge, ID, route, app, duration
- Correlation chain: arrow connectors between nodes, route name + duration per node
- Click on correlated exchange navigates to /exchanges/:app/:route/:exchangeId
- Compact styling with bg-raised background, proper visual hierarchy
- Horizontal scroll for long correlation chains

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

ui/src/pages/Exchanges/ExchangeHeader.module.css

@@ -1,61 +1,95 @@
+/* ── Header bar above diagram ─────────────────────────────────────────────── */
+
 .header {
   display: flex;
   flex-direction: column;
-  gap: 0.5rem;
+  gap: 0;
-  padding: 0.75rem;
   border-bottom: 1px solid var(--border);
-  background: var(--surface);
+  background: var(--bg-raised, var(--surface));
-  font-size: 0.8125rem;
+  flex-shrink: 0;
 }
 
-.summary {
+/* ── Exchange info row ────────────────────────────────────────────────────── */
+
+.info {
   display: flex;
   align-items: center;
   gap: 0.5rem;
-  flex-wrap: wrap;
+  padding: 0.5rem 0.75rem;
+  font-size: 0.75rem;
+  border-bottom: 1px solid var(--border-subtle);
+}
+
+.separator {
+  width: 1px;
+  height: 14px;
+  background: var(--border);
+  flex-shrink: 0;
+}
+
+.route {
+  font-weight: 600;
+  color: var(--text-primary);
+}
+
+.app {
+  color: var(--text-muted);
 }
 
 .duration {
   margin-left: auto;
   font-family: var(--font-mono);
-  font-size: 0.75rem;
+  font-size: 0.6875rem;
+  font-weight: 600;
+  color: var(--text-secondary);
 }
 
-/* ── Correlation chain ────────────────────────────────────────────────────── */
+/* ── Correlation chain row ────────────────────────────────────────────────── */
 
 .chain {
   display: flex;
-  flex-direction: row;
   align-items: center;
-  gap: 8px;
+  gap: 0;
-  padding-top: 8px;
+  padding: 0.375rem 0.75rem;
-  margin-top: 4px;
+  overflow-x: auto;
-  border-top: 1px solid var(--border-subtle);
-  flex-wrap: wrap;
 }
 
 .chainLabel {
-  font-size: 10px;
+  font-size: 9px;
-  font-weight: 600;
+  font-weight: 700;
   text-transform: uppercase;
-  letter-spacing: 0.5px;
+  letter-spacing: 0.8px;
   color: var(--text-muted);
-  margin-right: 4px;
+  margin-right: 0.5rem;
+  flex-shrink: 0;
+}
+
+.chainEntry {
+  display: inline-flex;
+  align-items: center;
+}
+
+.chainArrow {
+  color: var(--text-faint, var(--text-muted));
+  font-size: 10px;
+  margin: 0 4px;
+  flex-shrink: 0;
 }
 
 .chainNode {
   display: inline-flex;
   align-items: center;
   gap: 4px;
-  padding: 4px 10px;
+  padding: 3px 8px;
   border-radius: var(--radius-sm);
   border: 1px solid var(--border-subtle);
-  font-size: 11px;
+  font-size: 10px;
   font-family: var(--font-mono);
   cursor: pointer;
   background: var(--bg-surface);
   color: var(--text-secondary);
   transition: all 0.12s;
+  white-space: nowrap;
 }
 
 .chainNode:hover {
@@ -68,6 +102,7 @@
   border-color: var(--amber-light);
   color: var(--amber-deep);
   font-weight: 600;
+  cursor: default;
 }
 
 .chainNodeSuccess {
@@ -86,8 +121,11 @@
   border-left: 3px solid var(--warning);
 }
 
-.chainMore {
+.chainRoute {
-  color: var(--text-muted);
+  font-weight: 500;
-  font-size: 11px;
+}
-  font-style: italic;
+
+.chainDuration {
+  color: var(--text-muted);
+  font-size: 9px;
 }

ui/src/pages/Exchanges/ExchangeHeader.tsx

@@ -1,3 +1,4 @@
+import { useNavigate } from 'react-router';
 import { StatusDot, MonoText, Badge } from '@cameleer/design-system';
 import { useCorrelationChain } from '../../api/queries/correlation';
 import type { ExecutionDetail } from '../../components/ExecutionDiagram/types';
@@ -5,7 +6,6 @@ import styles from './ExchangeHeader.module.css';
 
 interface ExchangeHeaderProps {
   detail: ExecutionDetail;
-  onExchangeClick?: (executionId: string) => void;
 }
 
 type StatusVariant = 'success' | 'error' | 'running' | 'warning';
@@ -19,25 +19,45 @@ function statusVariant(s: string): StatusVariant {
   }
 }
 
+function statusLabel(s: string): string {
+  switch (s) {
+    case 'COMPLETED': return 'OK';
+    case 'FAILED': return 'ERR';
+    case 'RUNNING': return 'RUN';
+    default: return s;
+  }
+}
+
 function formatDuration(ms: number): string {
   if (ms >= 60_000) return `${(ms / 1000).toFixed(0)}s`;
   if (ms >= 1000) return `${(ms / 1000).toFixed(2)}s`;
   return `${ms}ms`;
 }
 
-export function ExchangeHeader({ detail, onExchangeClick }: ExchangeHeaderProps) {
+export function ExchangeHeader({ detail }: ExchangeHeaderProps) {
+  const navigate = useNavigate();
   const { data: chainResult } = useCorrelationChain(detail.correlationId ?? null);
   const chain = chainResult?.data;
   const showChain = chain && chain.length > 1;
 
-  if (!showChain) return null;
-
   return (
     <div className={styles.header}>
+      {/* Exchange info — always shown */}
+      <div className={styles.info}>
+        <StatusDot variant={statusVariant(detail.status)} />
+        <Badge label={statusLabel(detail.status)} color={statusVariant(detail.status)} />
+        <MonoText size="xs">{(detail.exchangeId || detail.executionId).slice(0, 16)}</MonoText>
+        <span className={styles.separator} />
+        <span className={styles.route}>{detail.routeId}</span>
+        <span className={styles.app}>{detail.applicationName}</span>
+        <span className={styles.duration}>{formatDuration(detail.durationMs)}</span>
+      </div>
+
+      {/* Correlation chain — only when multiple correlated exchanges exist */}
       {showChain && (
         <div className={styles.chain}>
-          <span className={styles.chainLabel}>Correlated Exchanges</span>
+          <span className={styles.chainLabel}>Correlated</span>
-          {chain.map((ce: any) => {
+          {chain.map((ce: any, i: number) => {
             const isCurrent = ce.executionId === detail.executionId;
             const variant = statusVariant(ce.status);
             const statusCls =
@@ -46,15 +66,22 @@ export function ExchangeHeader({ detail, onExchangeClick }: ExchangeHeaderProps)
               : variant === 'running' ? styles.chainNodeRunning
               : styles.chainNodeWarning;
             return (
-              <button
+              <span key={ce.executionId} className={styles.chainEntry}>
-                key={ce.executionId}
+                {i > 0 && <span className={styles.chainArrow}>&rarr;</span>}
-                className={`${styles.chainNode} ${statusCls} ${isCurrent ? styles.chainNodeCurrent : ''}`}
+                <button
-                onClick={() => { if (!isCurrent) onExchangeClick?.(ce.executionId); }}
+                  className={`${styles.chainNode} ${statusCls} ${isCurrent ? styles.chainNodeCurrent : ''}`}
-                title={`${ce.executionId} \u2014 ${ce.routeId}`}
+                  onClick={() => {
-              >
+                    if (!isCurrent) {
-                <StatusDot variant={variant} />
+                      navigate(`/exchanges/${ce.applicationName ?? detail.applicationName}/${ce.routeId}/${ce.executionId}`);
-                <span>{ce.routeId}</span>
+                    }
-              </button>
+                  }}
+                  title={`${ce.executionId}\n${ce.routeId} \u2014 ${formatDuration(ce.durationMs)}`}
+                >
+                  <StatusDot variant={variant} />
+                  <span className={styles.chainRoute}>{ce.routeId}</span>
+                  <span className={styles.chainDuration}>{formatDuration(ce.durationMs)}</span>
+                </button>
+              </span>
             );
           })}
         </div>