feat: schedule targeted refresh at each park's exact opening time

In addition to the 2-minute polling interval, compute milliseconds until
each park's opening time (from hoursLabel + park timezone) and schedule
a setTimeout to fire 30s after opening. This ensures the open indicator
and ride counts appear immediately rather than waiting up to 2 minutes.

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

components/HomePageClient.tsx

@@ -11,6 +11,34 @@ import { PARKS, groupByRegion } from "@/lib/parks";
 import type { DayData } from "@/lib/db";
 
 const REFRESH_INTERVAL_MS = 2 * 60 * 1000; // 2 minutes
+const OPEN_REFRESH_BUFFER_MS = 30_000;      // 30s after opening time before hitting the API
+
+/** Parse the opening hour/minute from a hoursLabel like "10am", "10:30am", "11am". */
+function parseOpenTime(hoursLabel: string): { hour: number; minute: number } | null {
+  const openPart = hoursLabel.split(" - ")[0].trim();
+  const match = openPart.match(/^(\d+)(?::(\d+))?(am|pm)$/i);
+  if (!match) return null;
+  let hour = parseInt(match[1], 10);
+  const minute = match[2] ? parseInt(match[2], 10) : 0;
+  const period = match[3].toLowerCase();
+  if (period === "pm" && hour !== 12) hour += 12;
+  if (period === "am" && hour === 12) hour = 0;
+  return { hour, minute };
+}
+
+/** Milliseconds from now until a given local clock time in a timezone. Negative if already past. */
+function msUntilLocalTime(hour: number, minute: number, timezone: string): number {
+  const now = new Date();
+  const parts = new Intl.DateTimeFormat("en-US", {
+    timeZone: timezone,
+    hour: "numeric",
+    minute: "2-digit",
+    hour12: false,
+  }).formatToParts(now);
+  const localHour   = parseInt(parts.find(p => p.type === "hour")!.value, 10) % 24;
+  const localMinute = parseInt(parts.find(p => p.type === "minute")!.value, 10);
+  return ((hour * 60 + minute) - (localHour * 60 + localMinute)) * 60_000;
+}
 
 const COASTER_MODE_KEY = "coasterMode";
 
@@ -54,6 +82,28 @@ export function HomePageClient({
     return () => clearInterval(id);
   }, [isCurrentWeek, router]);
 
+  // Schedule a targeted refresh at each park's exact opening time so the
+  // open indicator and ride counts appear immediately rather than waiting
+  // up to 2 minutes for the next polling cycle.
+  useEffect(() => {
+    if (!isCurrentWeek) return;
+    const timeouts: ReturnType<typeof setTimeout>[] = [];
+
+    for (const park of PARKS) {
+      const dayData = data[park.id]?.[today];
+      if (!dayData?.isOpen || !dayData.hoursLabel) continue;
+      const openTime = parseOpenTime(dayData.hoursLabel);
+      if (!openTime) continue;
+      const ms = msUntilLocalTime(openTime.hour, openTime.minute, park.timezone);
+      // Only schedule if opening is still in the future (within the next 24h)
+      if (ms > 0 && ms < 24 * 60 * 60 * 1000) {
+        timeouts.push(setTimeout(() => router.refresh(), ms + OPEN_REFRESH_BUFFER_MS));
+      }
+    }
+
+    return () => timeouts.forEach(clearTimeout);
+  }, [isCurrentWeek, today, data, router]);
+
   // Remember the current week so the park page back button returns here.
   useEffect(() => {
     localStorage.setItem("lastWeek", weekStart);