feat: redesign exchange detail page with interactive processor inspector

- Rewrite ExchangeDetail with split Message IN/OUT panels that update
  on processor click, error panel for failed processors, and
  Timeline/Flow toggle for the processor visualization
- Add correlation chain in header with status-colored clickable nodes
  sorted by start time, labeled "Correlated Exchanges"
- Add Exchange ID column and inspect button (↗) to Dashboard table
- Add "Open full details" link in the exchange slide-in panel
- Add selectedIndex prop to ProcessorTimeline and RouteFlow for
  highlighting the active processor
- Add onNodeClick + selectedIndex to RouteFlow for interactive use
- Add correlationGroup field to exchange mock data
- Fix sidebar section toggle indentation alignment

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

src/pages/Dashboard/Dashboard.module.css

@@ -223,3 +223,43 @@
   font-family: var(--font-mono);
   word-break: break-word;
 }
+
+/* Inspect exchange icon in table */
+.inspectLink {
+  background: transparent;
+  border: none;
+  color: var(--text-faint);
+  opacity: 0.75;
+  cursor: pointer;
+  font-size: 13px;
+  padding: 2px 4px;
+  border-radius: var(--radius-sm);
+  line-height: 1;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  transition: color 0.15s, opacity 0.15s;
+}
+
+.inspectLink:hover {
+  color: var(--text-primary);
+  opacity: 1;
+}
+
+/* Open full details link in panel */
+.openDetailLink {
+  background: transparent;
+  border: none;
+  color: var(--amber);
+  cursor: pointer;
+  font-size: 12px;
+  padding: 0;
+  font-family: var(--font-body);
+  transition: color 0.1s;
+}
+
+.openDetailLink:hover {
+  color: var(--amber-deep);
+  text-decoration: underline;
+  text-underline-offset: 2px;
+}

src/pages/Dashboard/Dashboard.tsx

@@ -1,5 +1,5 @@
 import { useState, useMemo } from 'react'
-import { useParams } from 'react-router-dom'
+import { useParams, useNavigate } from 'react-router-dom'
 import styles from './Dashboard.module.css'
 
 // Layout
@@ -68,8 +68,8 @@ function statusLabel(status: Exchange['status']): string {
   }
 }
 
-// ─── Table columns ────────────────────────────────────────────────────────────
-const COLUMNS: Column<Exchange>[] = [
+// ─── Table columns (base, without navigate action) ──────────────────────────
+const BASE_COLUMNS: Column<Exchange>[] = [
   {
     key: 'status',
     header: 'Status',
@@ -97,6 +97,14 @@ const COLUMNS: Column<Exchange>[] = [
       <span className={styles.appName}>{ROUTE_TO_APP.get(row.route) ?? row.routeGroup}</span>
     ),
   },
+  {
+    key: 'id',
+    header: 'Exchange ID',
+    sortable: true,
+    render: (_, row) => (
+      <MonoText size="xs">{row.id}</MonoText>
+    ),
+  },
   {
     key: 'timestamp',
     header: 'Started',
@@ -145,10 +153,34 @@ const SHORTCUTS = [
 // ─── Dashboard component ──────────────────────────────────────────────────────
 export function Dashboard() {
   const { id: appId, routeId } = useParams<{ id: string; routeId: string }>()
+  const navigate = useNavigate()
   const [selectedId, setSelectedId] = useState<string | undefined>()
   const [panelOpen, setPanelOpen] = useState(false)
   const [selectedExchange, setSelectedExchange] = useState<Exchange | null>(null)
 
+  // Build columns with inspect action as second column
+  const COLUMNS: Column<Exchange>[] = useMemo(() => {
+    const inspectCol: Column<Exchange> = {
+      key: 'correlationId' as keyof Exchange,
+      header: '',
+      width: '36px',
+      render: (_, row) => (
+        <button
+          className={styles.inspectLink}
+          title="Inspect exchange"
+          onClick={(e) => {
+            e.stopPropagation()
+            navigate(`/exchanges/${row.id}`)
+          }}
+        >
+          &#x2197;
+        </button>
+      ),
+    }
+    const [statusCol, ...rest] = BASE_COLUMNS
+    return [statusCol, inspectCol, ...rest]
+  }, [navigate])
+
   const { isInTimeRange, statusFilters } = useGlobalFilters()
 
   // Build set of route IDs belonging to the selected app (if any)
@@ -232,6 +264,16 @@ export function Dashboard() {
             onClose={() => setPanelOpen(false)}
             title={`${selectedExchange.orderId} — ${selectedExchange.route}`}
           >
+            {/* Link to full detail page */}
+            <div className={styles.panelSection}>
+              <button
+                className={styles.openDetailLink}
+                onClick={() => navigate(`/exchanges/${selectedExchange.id}`)}
+              >
+                Open full details &#x2192;
+              </button>
+            </div>
+
             {/* Overview */}
             <div className={styles.panelSection}>
               <div className={styles.panelSectionTitle}>Overview</div>