fix: Keep connector tool selected after creating a connection

Previously, the connector tool would switch back to cursor mode after
drawing a connection, requiring users to reselect the tool for each
new connector. This change maintains the connector tool selection,
improving workflow efficiency when creating multiple connections.

packages/fossflow-lib/src/interaction/modes/Connector.ts

@@ -100,9 +100,9 @@ export const Connector: ModeActions = {
     }
 
     uiState.actions.setMode({
-      type: 'CURSOR',
+      type: 'CONNECTOR',
       showCursor: true,
-      mousedownItem: null
+      id: null
     });
   }
 };