[Feature] I hope VText's lineThrough can independently set colors, as shown in the picture

### What problem does this feature solve?

Implement a function similar to change tracking
<img width="1559" height="209" alt="Image" src="https://github.com/user-attachments/assets/f3ee79a2-5732-4d99-a0c2-7de40db7b034" />

### What does the proposed API look like?

lineThroughColor