refactor: consolidate upload helpers

lib/client-object-urls.ts

@@ -0,0 +1,9 @@
+import type { FolderEntry } from '@/lib/client-types'
+
+export 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))
+}