feat: amber indicator during post-close wind-down buffer

Parks in the 1-hour buffer after scheduled close now show amber instead
of green: the dot on the desktop calendar turns yellow, and the mobile
card badge changes from "Open today" (green) to "Closing" (amber).

- getOperatingStatus() replaces isWithinOperatingWindow's inline logic,
  returning "open" | "closing" | "closed"; isWithinOperatingWindow now
  delegates to it so all callers are unchanged
- closingParkIds[] is computed server-side and threaded through
  HomePageClient → WeekCalendar/MobileCardList → ParkRow/ParkCard
- New --color-closing-* CSS variables mirror the green palette in amber

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

app/globals.css

@@ -27,6 +27,12 @@
   --color-open-text: #4ade80;
   --color-open-hours: #bbf7d0;
 
+  /* ── Closing — amber (post-close buffer, rides still winding down) ───────── */
+  --color-closing-bg: #1a1100;
+  --color-closing-border: #d97706;
+  --color-closing-text: #fbbf24;
+  --color-closing-hours: #fde68a;
+
   /* ── Passholder preview — vivid cyan ─────────────────────────────────────── */
   --color-ph-bg: #051518;
   --color-ph-border: #22d3ee;

app/page.tsx

@@ -1,7 +1,7 @@
 import { HomePageClient } from "@/components/HomePageClient";
 import { PARKS } from "@/lib/parks";
 import { openDb, getDateRange } from "@/lib/db";
-import { getTodayLocal, isWithinOperatingWindow } from "@/lib/env";
+import { getTodayLocal, isWithinOperatingWindow, getOperatingStatus } from "@/lib/env";
 import { fetchLiveRides } from "@/lib/scrapers/queuetimes";
 import { QUEUE_TIMES_IDS } from "@/lib/queue-times-map";
 import { readParkMeta, getCoasterSet } from "@/lib/park-meta";
@@ -62,12 +62,21 @@ export default async function HomePage({ searchParams }: PageProps) {
 
   let rideCounts: Record<string, number> = {};
   let coasterCounts: Record<string, number> = {};
+  let closingParkIds: string[] = [];
   if (weekDates.includes(today)) {
     const openTodayParks = PARKS.filter((p) => {
       const dayData = data[p.id]?.[today];
       if (!dayData?.isOpen || !QUEUE_TIMES_IDS[p.id] || !dayData.hoursLabel) return false;
       return isWithinOperatingWindow(dayData.hoursLabel, p.timezone);
     });
+    closingParkIds = openTodayParks
+      .filter((p) => {
+        const dayData = data[p.id]?.[today];
+        return dayData?.hoursLabel
+          ? getOperatingStatus(dayData.hoursLabel, p.timezone) === "closing"
+          : false;
+      })
+      .map((p) => p.id);
     const results = await Promise.all(
       openTodayParks.map(async (p) => {
         const coasterSet = getCoasterSet(p.id, parkMeta);
@@ -94,6 +103,7 @@ export default async function HomePage({ searchParams }: PageProps) {
       data={data}
       rideCounts={rideCounts}
       coasterCounts={coasterCounts}
+      closingParkIds={closingParkIds}
       hasCoasterData={hasCoasterData}
       scrapedCount={scrapedCount}
     />