polish: ride count copy, open indicator, and badge sizing

- "X rides open" → "X rides operating" (desktop + mobile)
- Green glowing dot next to park name when actively operating
- Hours text in calendar cells: larger (0.78rem) and bolder (600)
- Parks open badge: green tint when parks are open, larger text

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

app/page.tsx

@@ -112,13 +112,13 @@ export default async function HomePage({ searchParams }: PageProps) {
           </span>
 
           <span style={{
-            background: "var(--color-surface)",
-            border: "1px solid var(--color-border)",
+            background: visibleParks.length > 0 ? "var(--color-open-bg)" : "var(--color-surface)",
+            border: `1px solid ${visibleParks.length > 0 ? "var(--color-open-border)" : "var(--color-border)"}`,
             borderRadius: 20,
-            padding: "3px 10px",
-            fontSize: "0.7rem",
-            color: "var(--color-text-muted)",
-            fontWeight: 500,
+            padding: "4px 14px",
+            fontSize: "0.78rem",
+            color: visibleParks.length > 0 ? "var(--color-open-hours)" : "var(--color-text-muted)",
+            fontWeight: 600,
           }}>
             {visibleParks.length} of {PARKS.length} parks open
           </span>