feat: auto-refresh homepage data every 2 minutes on current week

Uses router.refresh() to re-run server data fetching (ride counts, open
status) without a full page reload. Only runs when viewing the current
week — no need to poll for past/future weeks.

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

components/HomePageClient.tsx

@@ -1,6 +1,7 @@
 "use client";
 
 import { useState, useEffect } from "react";
+import { useRouter } from "next/navigation";
 import { WeekCalendar } from "./WeekCalendar";
 import { MobileCardList } from "./MobileCardList";
 import { WeekNav } from "./WeekNav";
@@ -9,6 +10,8 @@ import { EmptyState } from "./EmptyState";
 import { PARKS, groupByRegion } from "@/lib/parks";
 import type { DayData } from "@/lib/db";
 
+const REFRESH_INTERVAL_MS = 2 * 60 * 1000; // 2 minutes
+
 const COASTER_MODE_KEY = "coasterMode";
 
 interface HomePageClientProps {
@@ -36,6 +39,7 @@ export function HomePageClient({
   hasCoasterData,
   scrapedCount,
 }: HomePageClientProps) {
+  const router = useRouter();
   const [coastersOnly, setCoastersOnly] = useState(false);
 
   // Hydrate from localStorage after mount to avoid SSR mismatch.
@@ -43,6 +47,13 @@ export function HomePageClient({
     setCoastersOnly(localStorage.getItem(COASTER_MODE_KEY) === "true");
   }, []);
 
+  // Periodically re-fetch server data (ride counts, open status) without a full page reload.
+  useEffect(() => {
+    if (!isCurrentWeek) return;
+    const id = setInterval(() => router.refresh(), REFRESH_INTERVAL_MS);
+    return () => clearInterval(id);
+  }, [isCurrentWeek, router]);
+
   // Remember the current week so the park page back button returns here.
   useEffect(() => {
     localStorage.setItem("lastWeek", weekStart);