refactor: consolidate upload helpers

hooks/useFolderEntries.ts

@@ -2,13 +2,7 @@
 
 import { useState, useCallback } from 'react'
 import type { FolderEntry } from '@/lib/client-types'
-
-function revokeEntryUrls(entry: FolderEntry) {
-  const urls = new Set<string>()
-  if (entry.modelUrl) urls.add(entry.modelUrl)
-  Object.values(entry.assetUrls || {}).forEach((url) => urls.add(url))
-  urls.forEach((url) => URL.revokeObjectURL(url))
-}
+import { revokeEntryUrls } from '@/lib/client-object-urls'
 
 export function useFolderEntries() {
   const [entries, setEntries] = useState<FolderEntry[]>([])