fix(bsky): highlighted notifications

[teidesu]

as of recently bsky started using <a> for notifications, which broke the currently used selectors

<div> is still used for some notifications (e.g. replies), so i kept that as well.

[RoootTheFox]

lgtm, works and is fine besides the version thing uncenter mentioned c:

_{(also, quick note to userstyles maintainers: once that issue is sorted, feel free to merge this right away as i likely won't be there at all until the end of next week, as i'll be busy with my school finals ^^)}