feat(tickets): add ticket detail subcomponents

- TicketDetailHeader: Display ticket info with status dropdown
- TicketNotesFeed: Chronological list of ticket notes with internal flag
- TicketAddNote: Form to add notes (requires linked session)
- TicketConfigs: Display related configurations/devices
- TicketRelated: List of related tickets as clickable buttons

All components use type-safe imports from psaContext and integrations APIs.
Styling follows design system (flat dark theme, electric blue accent, Tailwind v4).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/components/tickets/detail/TicketConfigs.tsx

@@ -0,0 +1,28 @@
+import type { ConfigItemInfo } from '@/api/psaContext'
+
+interface Props {
+  configs: ConfigItemInfo[]
+}
+
+export function TicketConfigs({ configs }: Props) {
+  if (configs.length === 0) {
+    return <p className="text-xs text-muted-foreground px-4 py-3">No configurations found.</p>
+  }
+
+  return (
+    <div className="divide-y divide-default">
+      {configs.map((config, i) => (
+        <div key={i} className="px-4 py-3 space-y-1.5">
+          <p className="text-sm font-medium text-primary">{config.device_identifier}</p>
+          <div className="grid grid-cols-2 gap-2 text-xs text-muted-foreground">
+            {config.type && <span>Type: {config.type}</span>}
+            {config.os_type && <span>OS: {config.os_type}</span>}
+            {config.ip_address && <span>IP: {config.ip_address}</span>}
+            {config.serial_number && <span>Serial: {config.serial_number}</span>}
+            {config.model_number && <span>Model: {config.model_number}</span>}
+          </div>
+        </div>
+      ))}
+    </div>
+  )
+}