set current year as default active year

Changes default year from first available year in database to current year (Date.now) when no year parameter is provided in URL.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

app/ui/HomePage.tsx

@@ -32,7 +32,7 @@ export const HomePage:FC<HomePageProps> = async ({ searchParams }) => {
     return (<MonthLocationList />);
   }
 
-  const currentYear = Number(searchParams?.year) || availableYears[0];
+  const currentYear = Number(searchParams?.year) || new Date().getFullYear();
   
   const locations = await fetchAllLocations(currentYear);