refactor(sync): drop favorite-folder tracking and deal

reaction_board/web/queries.py

@@ -1611,12 +1611,10 @@ class DashboardQueries:
             now = self._now()
             next_runs = {
                 "discover": int(now + cfg.schedule.discover_minutes * 60),
-                "folder_sync": int(now + cfg.schedule.folder_sync_minutes * 60),
                 "snapshot": int(next_daily_run(now, cfg.schedule.snapshot_at)),
             }
             for name, key, interval_minutes in (
                 ("discover", "discovery", cfg.schedule.discover_minutes),
-                ("folder_sync", "folder_sync", cfg.schedule.folder_sync_minutes),
             ):
                 record = tasks.get(key)
                 if isinstance(record, dict) and record.get("finished_at"):
@@ -1660,7 +1658,6 @@ class DashboardQueries:
                 "preview": self._kv(conn, "preview:seeded") == "1",
                 "schedule": {
                     "discover_minutes": cfg.schedule.discover_minutes,
-                    "folder_sync_minutes": cfg.schedule.folder_sync_minutes,
                     "snapshot_at": cfg.schedule.snapshot_at,
                     "candidate_ttl_days": cfg.schedule.candidate_ttl_days,
                 },