add user hover cards and ext. link warnings

[NoahCxrest]

this is my first PR, so i probably made a few mistakes. here's what i've done:

add user hover cards to relevant components

these are meant to be as unintrusive as possible and remove when the user scrolls. it takes 150ms for it to start loading the assets required for it on hover of a user-link.

add external link warnings

this checks if the user is visiting a link that is outside of the modrinth scope and gives them a warning if they are.

[NoahCxrest]

the command/ctrl+k menu is a fully localizable command menu that opens when a user presses the command/ctrl + k keybind.

Screen.Recording.2025-03-30.at.3.10.29.PM.mov

[imheavi]

This is awesome, hope this gets merged soon!

[IMB11]

Lots of great stuff in this pull request, would you be able to split it up into separate PRs though?

[NoahCxrest]

Lots of great stuff in this pull request, would you be able to split it up into separate PRs though?

Could take a while. If absolutely necessary, sure.

[Prospector]

Appreciate the contribution! A large PR like this with many unrelated features will likely not get merged, however, since the design and code review it would take is likely unjustifiable. If you'd like to reopen any of these features in the future as individual PRs, please do keep them small in scope and be prepared for both design and code reviews that may require significant changes.