Improve ad display logic and integrate ads into more pages

Refactor AdSenseAd component to use ResizeObserver for more reliable initialization and add the component to FolxStadlPage, GeschichteLiedPage, and GipfelstammtischPage.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 45a1dcfc-f8a2-475a-a6b9-96fbb841dc27
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/60d372ff-2c10-46c7-b01b-10c3435136b0/45a1dcfc-f8a2-475a-a6b9-96fbb841dc27/fmm3fpm

client/src/pages/FolxStadlPage.tsx

@@ -8,6 +8,7 @@ import { useState, useEffect } from 'react';
 import type { Video } from '@shared/schema';
 import { Input } from '@/components/ui/input';
 import { Search } from 'lucide-react';
+import AdSenseAd from '@/components/adsense-ad';
 
 export default function FolxStadlPage() {
   const [selectedVideo, setSelectedVideo] = useState<Video | null>(null);