feat: display trip title and date range in TripChecklist component

frontend/src/pages/TripChecklist.tsx

@@ -110,6 +110,13 @@ export default function TripChecklist({ trips }: { trips: any[] }) {
 
   return (
     <div>
+      {/* Trip-Titel und Zeitraum */}
+      <div className="mb-2">
+        <h2 className="text-xl font-bold">{trip.name}</h2>
+        <div className="text-gray-600 text-sm">
+          {trip.start_date} – {trip.end_date}
+        </div>
+      </div>
       {/* Tag-Liste */}
       <div className="mb-2 flex flex-wrap gap-2 items-center">
         <span className="font-semibold">Tags: </span>