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

backend/src/userbot/modules/stories/service.py

@@ -1,9 +1,8 @@
-from io import BytesIO
-
 from pyrogram import Client
 from pyrogram.types import Story
 
 from userbot.modules.capture.context import CaptureContext
+from userbot.modules.download import download_bytes
 from userbot.modules.stories import repository
 
 
@@ -24,9 +23,8 @@ async def save_story(client: Client, capture: CaptureContext, story: Story) -> N
         capture.pool, capture.account_id, peer_id, story.id
     )
     if not (stored or story.deleted or story.media is None):
-        buffer = await client.download_media(story, in_memory=True)
-        if isinstance(buffer, BytesIO):
-            data = buffer.getvalue()
+        data = await download_bytes(client, story)
+        if data is not None:
             storage_key = capture.storage.put(data)
             file_size = len(data)
             downloaded = True