Support multi-selection subscription moves

Signed-off-by: Loren Eteval <loren.eteval@proton.me>

Furious/Repository/Storage.py

@@ -118,6 +118,11 @@ class Storage:
         """Return one subscription group by stable ID."""
         return Storage._UserSubsStorage().group(unique)
 
+    @staticmethod
+    def moveSubscriptionGroups(groupIds, position: str) -> bool:
+        """Move selected subscription groups in their persisted display order."""
+        return Storage._UserSubsStorage().moveGroups(groupIds, position)
+
     @staticmethod
     def upsertSubscriptionGroup(group: SubscriptionGroup):
         """Persist one subscription group through the shared repository."""