chore: import upstream snapshot with attribution

apps/sim/lib/content/utils.ts

@@ -0,0 +1,24 @@
+import fs from 'fs/promises'
+
+export async function ensureContentDirs(contentDir: string, authorsDir: string) {
+  await fs.mkdir(contentDir, { recursive: true })
+  await fs.mkdir(authorsDir, { recursive: true })
+}
+
+export function toIsoDate(value: Date | string | number): string {
+  if (value instanceof Date) return value.toISOString()
+  return new Date(value).toISOString()
+}
+
+export function byDateDesc<T extends { date: string }>(a: T, b: T) {
+  return new Date(b.date).getTime() - new Date(a.date).getTime()
+}
+
+/** Most recent `updated ?? date` across a set of posts, or `undefined` if empty. */
+export function latestModified<T extends { date: string; updated?: string }>(
+  posts: T[]
+): Date | undefined {
+  return posts.length > 0
+    ? new Date(Math.max(...posts.map((p) => new Date(p.updated ?? p.date).getTime())))
+    : undefined
+}