From #21: _expand_ltx_entry ran positive/negative through to_list, so the
Builder's [["p1","p2"]] reached the LTX encoder as a list; it now uses
parse_prompt_input_nested like expand_configs. The text-encoder dropdown
falls back to ["None"] when the list is empty. convertConfigsToConfigArrays
keeps the per-entry model type for builder-schema models[].
Refs #21
Co-authored-by: DRuggeri <DRuggeri@users.noreply.github.com>
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>