Add required stats filter to trader

[vaisest]

Fixes #471.

Description of the problem being solved:

Adds a UI which can be used to add an AND filter to the query. There are quite a few old issues about this in the pob1 repo. This is especially useful for e.g. spirit, filling attributes, or corrupted blood jewels in poe1

This also fixes an issue where a row didn't get cleared when results were empty.

Steps taken to verify a working solution:

• All slots tested
• Many modifiers tested

Link to a build that showcases this PR:

Before screenshot:

After screenshot:

Path.space.of.space.Building-PoE2_2026-06-25_19-11-58.mp4

[vaisest]

I considered adding a NOT section that would blacklist some mods from having weights generated, but I can't really see this being comfortable to use. There are very few things that actually need it in rare gear, and I think it's probably mostly just cull which we might as well manually blacklist.

Megalomaniac have mods which inflate values for sure, but it would be quite uncomfortable to use. Manually editing the search and using price item is probably faster than doing the whole thing again, because it's likely you'll only realise it's giving you bad notables when you look at the results. It would also be more difficult to make a searchable list of the nodes.