refactor(content-card): fix indentation and improve readability

- Fixed inconsistent indentation in `content-card` component.
- Enhanced code readability by restructuring JSX elements properly.

frontend/src/components/content-card.tsx

@@ -100,7 +100,9 @@ export function ContentCard({ content, onUpdate }: ContentCardProps) {
 				<CardHeader className="p-4 flex flex-row items-center space-y-0 gap-3">
 					<Avatar className="h-8 w-8">
 						<AvatarImage src={content.author.avatarUrl} />
-						<AvatarFallback>{content.author.username[0].toUpperCase()}</AvatarFallback>
+						<AvatarFallback>
+							{content.author.username[0].toUpperCase()}
+						</AvatarFallback>
 					</Avatar>
 					<div className="flex flex-col">
 						<Link