fix(userbot): drop stale media sessions and survive download timeouts

backend/src/userbot/modules/jobs/handlers/fetch_avatar.py

@@ -1,10 +1,9 @@
-from io import BytesIO
-
 from pyrogram import Client
 from pyrogram.errors import FileIdInvalid, FileReferenceExpired, FileReferenceInvalid
 from pyrogram.types import Photo
 
 from userbot.modules.avatars.repository import get_avatar_file, mark_avatar_downloaded
+from userbot.modules.download import download_bytes
 from userbot.modules.jobs.context import JobContext
 from userbot.modules.jobs.registry import register
 
@@ -29,13 +28,12 @@ async def _download(
     client: Client, owner_id: int, unique_id: str, file_id: str
 ) -> bytes | None:
     try:
-        buffer = await client.download_media(file_id, in_memory=True)
+        return await download_bytes(client, file_id)
     except STALE_FILE_ID:
         fresh = await _fresh_file_id(client, owner_id, unique_id)
         if fresh is None:
             return None
-        buffer = await client.download_media(fresh, in_memory=True)
-    return buffer.getvalue() if isinstance(buffer, BytesIO) else None
+        return await download_bytes(client, fresh)
 
 
 @register("fetch_avatar")