how do i search for fully allocated crucible trees in the trade site?

can i even do that? need some help pls

I don't know of any way you can. Just filter which passives you want and start scrolling. There also isn't a way to identify if what you want is on the same path without manually scanning. The Crucible passive trees will not go core in their current form, so GGG has little incentive to invest much in trade filters.

I would also like to learn a method of searching for passive trees,
but as the man suggests: why invest so much time on the filter for
prototype content that wont go core in its current form.

that being said. I can all but guarantee the items you craft
this league will exist unchanged in standard. you will not be
able to adapt them through crucible encounters though.

so make sure to get the bases you most want sorted out this
league if you mean to use them in standard. if you use an imperial
bow on your best, favorite std build but are running some DOT build
in crucible? collect a bunch of imperial bows! find good trees...
meld two high ilvl bows with good trees before the end of league.

so to feed your std bowman a wild new bow.

I always run casters. so its easy for me. caster wands at all times.
caster shields at all times.

I believe the geodes we get will work in standard. but dont save them.
use them here to merge items before the league ends. and just keep getting
more. any leftovers will probably still exist in std. like ultimatums etc.