dark/dark-reader mode for inbuilt web browser

### Describe the request

option to view web links in internal browser in dark and/or dark reader mode, where users suffer from vision impairment made worse by bright light sources.

<img width="1186" height="549" alt="Image" src="https://github.com/user-attachments/assets/c46192ae-7fde-497d-9d65-c5b615a8b56c" />
<img width="1186" height="549" alt="Image" src="https://github.com/user-attachments/assets/e28f856d-d1d9-4e35-9d81-d10612e6751d" />

### Checks

- [x] This follows the [GNOME HIG](https://developer.gnome.org/hig/).

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dark/dark-reader mode for inbuilt web browser #1629

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dark/dark-reader mode for inbuilt web browser #1629

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Describe the request

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