Implement journey ranking and improve UI presentation

Add `rankJourneys` utility to score connections based on arrival fit,
directness, and duration. Update `JourneyList` to display the best option
first with a "Top" badge and allow expanding to see more. Fix HAFAS
parser to include train direction in journey details. Limit API result
count to 5 and add TypeScript declaration for PNG assets.

apps/web/src/app/api/hafas/route.ts

@@ -181,7 +181,7 @@ export async function POST(request: NextRequest) {
 
     // Cap TripSearch results at 10
     if (svcReq.meth === "TripSearch" && svcReq.req && typeof svcReq.req.numF !== "undefined") {
-      svcReq.req.numF = Math.min(Number(svcReq.req.numF), 10);
+      svcReq.req.numF = Math.min(Number(svcReq.req.numF), 5);
     }
 
     const controller = new AbortController();