feat: add stacked public notes

src/modules/atproto/parseAtUri.ts

@@ -0,0 +1,7 @@
+export const parseAtUri = (atUri: string): { did: string; rkey: string } => {
+  const match = atUri.match(/^at:\/\/(did:[^/]+)\/[^/]+\/(.+)$/)
+  if (!match) {
+    throw new Error(`Invalid AT URI: ${atUri}`)
+  }
+  return { did: match[1], rkey: match[2] }
+}