[Bug]: 语句前方有注释时，提供的补全项有问题

### Version

 4.2.0

### Which SQL?

Spark

### SQL content

```sql
-- the comment
SELECT * FROM db.
```

### JavaScript/TypeScript code

```typescript

```

### What happened?

wordRanges 返回的内容不对。SparkSQL、HiveSQL 可复现，其他 SQL 待验证

<img width="1148" alt="Image" src="https://github.com/user-attachments/assets/6d8f673f-8965-429d-8009-fdfbfeb2e51d" />

### Relevant log output

```shell

```