add end date and create logo and fix filter

lib/utils.ts

@@ -17,3 +17,13 @@ export function formatDate(date: Date | string): string {
     dateStyle: "long",
   }).format(new Date(date));
 }
+
+export function formatDateRange(
+  start: Date | string,
+  end?: Date | string | null
+): string {
+  const startStr = formatDate(start);
+  if (!end) return startStr;
+  const endStr = formatDate(end);
+  return `${startStr} — ${endStr}`;
+}