[DevTask] Improve the filter condition selection experience

[huchenlei]

Currently if you click the text box, it shows you fuzzy matching results based on current input value in the searchbox. You only get the full list of options if you have an empty searchbox or you click the down arrow button.

[JorgeR81]

A node preview would also be nice.

ComfyUX just added this:

https://www.reddit.com/r/comfyui/comments/1ea52zq/get_enouched_of_native_searchboxtry_comfyux/

edit: I noticed you already have a preview, but these look better, more similar to the original node.