fix: render today's wait chart in viewer's local time + close stale live state

Two related polish fixes for the ride detail page:

1. Wait-time chart x-axis now uses Intl.DateTimeFormat with no timezone
   argument, so an Eastern-time user viewing a Pacific park sees ET on
   the axis. Backend now sends recorded_at (UTC) alongside local_time.

2. Ride-history endpoint now applies the same operating-window gate the
   /rides route uses. Queue-Times keeps reporting yesterday's last wait
   with isOpen=true overnight, which made the "Right now" pill show a
   live wait time when the park was actually closed.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

app/park/[id]/ride/[slug]/page.tsx

@@ -10,6 +10,7 @@ const BACKEND_URL = process.env.BACKEND_URL ?? "http://localhost:3001";
 type Tab = "today" | "7d" | "30d";
 
 interface TodaySample {
+  recordedAt: string;
   localTime: string;
   isOpen: boolean;
   waitMinutes: number | null;