Standardize page layouts and footer width for consistent appearance

Update various page components and the footer to use a `max-w-7xl` width for consistent layout across the site. Removes explicit `contentHalfWidth` props from `PageSideAds` components, allowing them to default to the standardized width.

Replit-Commit-Author: Agent
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Replit-Commit-Event-Id: 2d87eb5e-a5f7-4bb4-8334-5904d9d52843
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client/src/pages/empfang.tsx

@@ -38,8 +38,8 @@ export default function EmpfangPage() {
   return (
     <div className="min-h-screen bg-background">
       <Header />
-      <PageSideAds contentHalfWidth={448} />
-      <main className="max-w-4xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
+      <PageSideAds />
+      <main className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
         <div className="flex items-center gap-3 mb-2">
           <Tv className="w-7 h-7 text-primary" />
           <h1 className="text-3xl font-bold text-foreground" data-testid="text-empfang-title">