The editor snapshotted caption_json during onNodeCreated, but ComfyUI restores
widgets_values via node.configure() afterwards, so reloads / dropped saved
images seeded from the empty default and the used prompt was lost.
Seed from the live widget value instead, via a re-runnable seedFromWidget(),
and re-seed from a new onConfigure hook so the caption appears whenever ComfyUI
restores the node's saved data.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
