@sam How about this: we reuse the sidebar nested dropdown? (ignore icons)
That way, we can keep it super consistent: every bookmark-post can have its own direct menu. We don’t need to make any change depending on how many bookmarks there are.
For the icon, let’s do this:
No bookmarks: outline
Only post bookmarked: solid grey
Topic bookmarked: solid blue
And then we match this behaviour in the topic list, with no icon/grey icon/blue icon.