Frontend 1.53+ adopts custom widgets placed in node.widgets into a
store-backed LegacyWidget. The custom ImageListWidget's value then reads
from the store, so uploaded images were never serialized ("images": "[]")
and the instanceof checks for drag/drop and paste stopped matching.
Keep the original "images" STRING widget as the stored value (hidden, same
position so old workflows load) and add a display-only "images_ui" widget
that reads and writes through it. Use an own-property marker instead of
instanceof.
Written against frontend 1.52.7 and 1.55.18 sources; not yet browser-tested.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
