refactor(media): share outbound attachment resolver

src/media/outbound-attachment.ts

@@ -0,0 +1,16 @@
+import { loadWebMedia } from "../web/media.js";
+import { saveMediaBuffer } from "./store.js";
+
+export async function resolveOutboundAttachmentFromUrl(
+  mediaUrl: string,
+  maxBytes: number,
+): Promise<{ path: string; contentType?: string }> {
+  const media = await loadWebMedia(mediaUrl, maxBytes);
+  const saved = await saveMediaBuffer(
+    media.buffer,
+    media.contentType ?? undefined,
+    "outbound",
+    maxBytes,
+  );
+  return { path: saved.path, contentType: saved.contentType };
+}