git_ui: Apply accented color to links in Blame tooltip (#40124)

# Why

Follow up to:
* #39905

# How

Apply accented color to links in message content inside Blame tooltip,
to match appearance in Markdown Preview panel.

Release Notes:

- Improved appearance of links in message content inside Blame tooltip.

# Preview

### Before

<img width="1186" height="798" alt="Screenshot 2025-10-13 at 19 33 37"
src="https://github.com/user-attachments/assets/33ab4fb5-7910-4d28-9152-c692d6ddeaa6"
/>

### After

<img width="1186" height="798" alt="Screenshot 2025-10-13 at 19 33 10"
src="https://github.com/user-attachments/assets/38082c5c-50d6-4fb3-90ca-410accff9aad"
/>

---------

Co-authored-by: Danilo Leal <daniloleal09@gmail.com>
ab70555a8aBartosz Kaszubowski committed on 10/14/2025, 1:16:05 PM· committed by GitHubparent474eb8d
1 file changedLine totals unavailable