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Fix active node display in side panel
The minimal fix is the switch from `toRefs` to the computed property for configForm. I think that is because when we inserted a minimal new step we didn't include the `config_form` key, and so the later addition wasn't reactive ? Not exactly sure that is the right explanation. In any case the extended fix creates valid object that satisfies the `NewStep` interface, and drop the label and annotation handling, which does not happen in the tool state inputs.