Harden account import/continuous behavior and finish multi-account UI polish

app_state.py

@@ -25,7 +25,7 @@ ACCOUNT_DEFAULTS: Dict[str, Any] = {
     "scrape_media": True,
     "forwarding_rules": [],
     "continuous_scraping": {
-        "enabled": True,
+        "enabled": False,
         "interval_minutes": 1,
         "channels": [],
         "run_all_tracked": True,