refactor: format imports, fix indentation, and improve readability across files

Apply consistent import ordering and indentation in frontend and backend files. Ensure better maintainability and adherence to code style standards.

frontend/src/components/user-nav-mobile.tsx

@@ -29,9 +29,7 @@ export function UserNavMobile() {
 			<Link href="/profile">
 				<Avatar className="h-8 w-8 border">
 					<AvatarImage src={user.avatarUrl} alt={user.username} />
-					<AvatarFallback>
-						{user.username.slice(0, 2).toUpperCase()}
-					</AvatarFallback>
+					<AvatarFallback>{user.username.slice(0, 2).toUpperCase()}</AvatarFallback>
 				</Avatar>
 			</Link>
 		</Button>