Fill property not being respected on text

Nobody has claimed this yet.

I apologize if another issue already covers this; I'm not super knowledgeable about the SVG spec, so I'm not quite sure what should cover this.

I've got an SVG with coloured text, generated by Typst:

(Hopefully you should be able to use the above to get back an SVG file? If not let me know and I'll figure out another way -- perhaps a zip file?)

As you can see in the GitHub preview, the text is white & red, however when rendered with resvg, I get:

I'm not entirely sure if this is an error on my part, or if this is a bug in resvg.

My code essentially amounts to:
```rs
let tree = Tree::from_data(svg.as_bytes(), &Options::default())?;
let mut buffer = Pixmap::new(...);

buffer.data_mut().fill(0); // resetting from a previous render

let size = tree.size();

let transform = Transform::from_scale(
buffer.width() as f32 / size.width(),
buffer.height() as f32 / size.height(),
);

resvg::render(
&tree,
transform,
&mut buffer,
);
```

The issue names no repository file or test. Start by obtaining the attached Typst-generated SVG and reproducing it with the shown Rust snippet, then compare the rendered text fills with the expected output. Done means the fill behavior is corrected or clearly narrowed to an SVG-spec issue, with a regression test for the case.

Written by the indexing model from the issue text.