Bug: passing mb to Title component has no effect.

# What happens

If you pass `mb=0` to the Title component the margin still stays at `1em`, caused by `h3.margin-block-end`.

# Expected behavior: 

Overwrite margin when passed explictly.

# Example Code:

```
<Title mb={0}> My Title</Title>
```

![Image](https://github.com/user-attachments/assets/fc5e86b5-58bc-4196-93e1-9428673b3ebf)