Vlad
I suggest using Alt key as the modifier for opening everything (links/tabs/bookmarks) in "peek" instead of Arc's arbitrary behavior of only some things.
I asked in discord and nobody seems to use the Alt key function that downloads html link, and this behavior seems exclusive to Safari/Orion. No other browsers i have tested use alt for that. but im fine with any easy accessible hot key if a problem with Alt
Here is how it could look and work:
Clicking anything with Alt would open something similar to the new webapps in RC on top of the window. While whitening background page (like arc):

Clicking the background page would close the peek.
Function of buttons:

I think this is a great function coupled with searching (kagi) since you can stay on your results and check each individual link out.
The style of the buttons are inspired from how "Preview" look when doing pdfs in presentation. But how it looks in Arc or any other style is also fine with me.