Table border not aligned with the text

Testing #326540

- Use the markdown:

```
# Table

| Feature | Supported | Notes |
| :----------- | :-------: | -------------------------------- |
| Headings | ✅ | Six levels available |
| Emphasis | ✅ | Bold, italic, strikethrough |
| Task lists | ✅ | Checked and unchecked items |
| Math | ✅ | Inline and block via KaTeX/MathJax |
| Mermaid | ✅ | Rendered diagrams |
```

- Go into the editing mode
- Resize the editor so it is narrow
- Notice the ---| overlaps with the text in the table
- See the screen recording below

https://github.com/user-attachments/assets/8917d579-5049-4242-8c36-39c5fb26fb45