fix: pair code timer — expiresAt camelCase after snake→camel transform

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

src/lib/api.ts

@@ -326,7 +326,7 @@ export const api = {
     remove: (slug: string, id: string) =>
       req<void>('DELETE', `/api/hotels/${slug}/workstations/${id}`),
     pairCode: (slug: string, id: string) =>
-      req<{ code: string; expires_at: string }>('POST', `/api/hotels/${slug}/workstations/${id}/pair-code`),
+      req<{ code: string; expiresAt: string }>('POST', `/api/hotels/${slug}/workstations/${id}/pair-code`),
     listDevices: (slug: string, id: string) =>
       req<WorkstationDevice[]>('GET', `/api/hotels/${slug}/workstations/${id}/devices`),
     addDevice: (slug: string, id: string, data: Partial<WorkstationDevice>) =>

src/pages/EquipmentPage.tsx

@@ -71,7 +71,7 @@ function PairCodeModal({
   useEffect(() => {
     api.workstations.pairCode(slug, workstation.id).then(r => {
       setCode(r.code)
-      setExpiresAt(r.expires_at)
+      setExpiresAt(r.expiresAt)
       setLoading(false)
     })
   }, [slug, workstation.id])