fix(ui): guard invalid log detail timestamps

ui/src/components/logs/logs-detail-panel.tsx

@@ -9,6 +9,7 @@ import { LogLevelBadge } from './log-level-badge';
 import { LogsEmpty } from './logs-empty';
 import {
   formatJson,
+  formatLogTimestampIso,
   getDisplayLatency,
   getDisplayModule,
   getDisplayRequestId,
@@ -34,7 +35,7 @@ interface OverviewRow {
 function buildOverviewRows(entry: LogsEntry, sourceLabel?: string): OverviewRow[] {
   // Use shared accessors so this panel and the list row never diverge.
   return [
-    { label: 'Time', value: new Date(entry.timestamp).toISOString(), mono: true },
+    { label: 'Time', value: formatLogTimestampIso(entry.timestamp), mono: true },
     { label: 'Level', value: entry.level },
     { label: 'Module', value: getDisplayModule(entry, sourceLabel) },
     { label: 'Stage', value: getDisplayStage(entry) },

ui/src/components/logs/utils.ts

@@ -21,6 +21,19 @@ export function formatLogTimestamp(timestamp: string | null | undefined) {
   }).format(date);
 }
 
+export function formatLogTimestampIso(timestamp: string | null | undefined) {
+  if (!timestamp) {
+    return 'No activity yet';
+  }
+
+  const date = new Date(timestamp);
+  if (Number.isNaN(date.getTime())) {
+    return timestamp;
+  }
+
+  return date.toISOString();
+}
+
 export function formatRelativeLogTime(timestamp: string | null | undefined) {
   if (!timestamp) {
     return 'No activity yet';