feat: park page operating window check; always show ride total

- Extract isWithinOperatingWindow() to lib/env.ts (shared)
- Park detail page: always fetch Queue-Times, but force all rides
  closed when outside the ±1h operating window
- LiveRidePanel: always show closed ride count badge (not just when
  some rides are also open); label reads "X rides total" when none
  are open vs "X closed / down" when some are

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

components/LiveRidePanel.tsx

@@ -57,8 +57,8 @@ export function LiveRidePanel({ liveRides, parkOpenToday }: LiveRidePanelProps)
           </div>
         )}
 
-        {/* Closed count badge */}
-        {anyOpen && closedRides.length > 0 && (
+        {/* Closed count badge — always shown when there are closed rides */}
+        {closedRides.length > 0 && (
           <div style={{
             background: "var(--color-surface)",
             border: "1px solid var(--color-border)",
@@ -69,7 +69,7 @@ export function LiveRidePanel({ liveRides, parkOpenToday }: LiveRidePanelProps)
             color: "var(--color-text-muted)",
             flexShrink: 0,
           }}>
-            {closedRides.length} closed / down
+            {closedRides.length} {anyOpen ? "closed / down" : "rides total"}
           </div>
         )}