feat: harden multi-account backend and add tests

telegram_scraper_with_forwarding.py

@@ -23,11 +23,8 @@ from telethon.errors import FloodWaitError, SessionPasswordNeededError
 import qrcode
 from app_state import (
     StateStore,
-    account_data_dir,
     account_session_path,
     get_account_store,
-    load_account,
-    save_account,
 )
 
 warnings.filterwarnings(