fix: add groupName to ExecutionSummary, locale format stat values, inspect column, fix duplicate keys

- Added groupName field to ExecutionSummary Java record and OpenSearch mapper
- Dashboard stat cards use locale-formatted numbers (en-US)
- Added inspect column (↗) linking directly to exchange detail page
- Fixed duplicate React key warning from two columns sharing executionId key

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

ui/src/pages/Dashboard/Dashboard.tsx

@@ -84,6 +84,17 @@ export default function Dashboard() {
         </span>
       ),
     },
+    {
+      key: '_inspect' as any, header: '', width: '36px',
+      render: (_v, row) => (
+        <a
+          href={`/exchanges/${row.executionId}`}
+          onClick={(e) => { e.stopPropagation(); e.preventDefault(); navigate(`/exchanges/${row.executionId}`); }}
+          className={styles.inspectLink}
+          title="Open full details"
+        >&#x2197;</a>
+      ),
+    },
     { key: 'routeId', header: 'Route', sortable: true, render: (v) => <span>{String(v)}</span> },
     { key: 'groupName', header: 'Application', sortable: true, render: (v) => <span>{String(v ?? '')}</span> },
     { key: 'executionId', header: 'Exchange ID', sortable: true, render: (v) => <MonoText size="xs">{String(v)}</MonoText> },
@@ -193,7 +204,7 @@ export default function Dashboard() {
       <div className={styles.healthStrip}>
         <StatCard
           label="Exchanges"
-          value={totalCount.toLocaleString()}
+          value={totalCount.toLocaleString('en-US')}
           detail={`${successRate.toFixed(1)}% success rate`}
           trend={exchangeTrend > 0 ? 'up' : exchangeTrend < 0 ? 'down' : 'neutral'}
           trendValue={exchangeTrend > 0 ? `+${exchangeTrend.toFixed(0)}%` : `${exchangeTrend.toFixed(0)}%`}
@@ -203,7 +214,7 @@ export default function Dashboard() {
         <StatCard
           label="Success Rate"
           value={`${successRate.toFixed(1)}%`}
-          detail={`${(totalCount - failedCount).toLocaleString()} ok / ${failedCount} error`}
+          detail={`${(totalCount - failedCount).toLocaleString('en-US')} ok / ${failedCount} error`}
           trend={successRateDelta >= 0 ? 'up' : 'down'}
           trendValue={`${successRateDelta >= 0 ? '+' : ''}${successRateDelta.toFixed(1)}%`}
           accent="success"
@@ -226,8 +237,8 @@ export default function Dashboard() {
         />
         <StatCard
           label="Latency p99"
-          value={stats?.p99LatencyMs ?? 0}
-          detail={`${stats?.p99LatencyMs ?? 0}ms`}
+          value={(stats?.p99LatencyMs ?? 0).toLocaleString('en-US')}
+          detail={`${(stats?.p99LatencyMs ?? 0).toLocaleString('en-US')}ms`}
           sparkline={sparkLatency}
           accent="warning"
         />