TriggerWord Toggle serialized the transient `highlighted` UI state into
widgets_values, but highlight is recomputed after load from the current
selection/library, so an untouched workflow always compared dirty against
the saved JSON and ComfyUI prompted to save on close. Strip `highlighted`
from serialized tag values (backend never reads it).
Also restore saved widget values by widget name instead of positional
index (position drift corrupted unrelated widget slots on load), and
preserve `locked` in mergeLoras so load-time merging no longer drops it.
Workflows saved with `highlighted` keys will show as modified once after
upgrading; saving them once writes the clean format.
Fixes#893
