feat: rua快捷键合并后，自动选中合并后的节点

Author: Littlefean

app/src/core/service/controlService/shortcutKeysEngine/shortcutKeysRegister.tsx

@@ -919,6 +919,8 @@ export class KeyBindsRegistrar {
         details: mergeDetails,
       });
       this.project.stageManager.add(newTextNode);
+      // 选中新的节点
+      newTextNode.isSelected = true;
       this.project.stageManager.deleteEntities(selectedTextNodes);
     });