refactor: extract duplicated utility functions into shared format-utils

Consolidate formatDuration, statusToVariant, statusLabel, formatTimestamp,
toRouteNodeType, and durationClass from 5 page/component files into one
shared utils module.

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

src/mocks/searchData.tsx

@@ -3,34 +3,7 @@ import { exchanges, type Exchange } from './exchanges'
 import { routes } from './routes'
 import { agents } from './agents'
 import { SIDEBAR_APPS, buildRouteToAppMap, type SidebarApp } from './sidebar'
-
-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`
-}
-
-function statusLabel(status: Exchange['status']): string {
-  switch (status) {
-    case 'completed': return 'OK'
-    case 'failed': return 'ERR'
-    case 'running': return 'RUN'
-    case 'warning': return 'WARN'
-  }
-}
-
-function statusToVariant(status: Exchange['status']): string {
-  switch (status) {
-    case 'completed': return 'success'
-    case 'failed': return 'error'
-    case 'running': return 'running'
-    case 'warning': return 'warning'
-  }
-}
-
-function formatTimestamp(date: Date): string {
-  return date.toLocaleTimeString('en-GB', { hour: '2-digit', minute: '2-digit', second: '2-digit' })
-}
+import { formatDuration, statusLabel, statusToVariant, formatTimestamp } from '../utils/format-utils'
 
 function healthToColor(health: SidebarApp['health']): string {
   switch (health) {