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.

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client/src/components/footer.tsx

@@ -11,7 +11,7 @@ const SOCIAL_LINKS = [
 export default function Footer() {
   return (
     <footer className="border-t border-border mt-16" data-testid="footer">
-      <div className="max-w-4xl mx-auto px-4 sm:px-6 lg:px-8 py-10 relative z-20">
+      <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-10 relative z-20">
         <div className="grid grid-cols-1 md:grid-cols-3 gap-8">
           <div>
             <h3 className="font-bold text-card-foreground text-lg mb-3">Folx Music Television</h3>