markdown_preview: Stylize links using accented text color (#39149)

# How

Emphasize links in Markdown Preview text using accented text color. 

> [!note]
> I have chosen the accent color for links since it was looking fine
with all bundled by default themes, but I'm happy to alter the color to
use different theme value, if you have better candidates.

Release Notes:

- Stylize links using accented text color in Markdown Preview

# Preview

### Before

<img width="1606" height="1066" alt="Screenshot 2025-09-29 at 22 19 38"
src="https://github.com/user-attachments/assets/59b6ee72-4523-42fb-a468-9c694d30b5df"
/>

### After
<img width="1652" height="1066" alt="Screenshot 2025-09-29 at 22 18 20"
src="https://github.com/user-attachments/assets/e00e3742-6435-4c1d-aaaa-e6332719db17"
/>
<img width="1652" height="1066" alt="Screenshot 2025-09-29 at 22 18 47"
src="https://github.com/user-attachments/assets/a1b76f4a-c4d2-4ca8-ae3c-fc4dc5d55e01"
/>

**Release notes**

<img width="2090" height="582" alt="Screenshot 2025-09-29 at 22 36 33"
src="https://github.com/user-attachments/assets/81d6df12-83bd-4794-b71e-5a1fd40f0140"
/>
<img width="2090" height="582" alt="Screenshot 2025-09-29 at 22 40 41"
src="https://github.com/user-attachments/assets/aa820767-b82b-42a5-aa5b-b0d3d22ac5e3"
/>

crates/markdown_preview/src/markdown_parser.rs

@@ -261,7 +261,7 @@ impl<'a> MarkdownParser<'a> {
                             code: false,
                             link: Some(link),
                         });
-                        style.underline = true;
+                        style.link = true;
                         prev_len
                     } else {
                         // Manually scan for links
@@ -329,7 +329,7 @@ impl<'a> MarkdownParser<'a> {
                         highlights.push((
                             prev_len..text.len(),
                             MarkdownHighlight::Style(MarkdownHighlightStyle {
-                                underline: true,
+                                link: true,
                                 ..Default::default()
                             }),
                         ));