fix(models): remove dead og-utils exports, fix formatTokenCount null guard

Author: waleedlatif1

apps/sim/app/(landing)/models/og-utils.tsx

@@ -1,8 +1,6 @@
 import { ImageResponse } from 'next/og'
 
-export const runtime = 'edge'
-export const contentType = 'image/png'
-export const size = {
+const size = {
   width: 1200,
   height: 630,
 }

apps/sim/app/(landing)/models/utils.ts

@@ -135,7 +135,7 @@ export interface CatalogProvider {
 }
 
 export function formatTokenCount(value?: number | null): string {
-  if (!value) {
+  if (value == null) {
     return 'Unknown'
   }