parseGuidOrNull requires the strict Figma GUID shape (sessionID:localID),
but every OpenPencil code path that creates a component property definition
uses `prop:<hex>` IDs, which never match. applyComponentMetadata silently
dropped componentPropDefs/componentPropRefs/componentPropAssignments/
variantPropSpecs whenever any entry failed that check, so any component
property created by the app (as opposed to imported straight from a real
Figma file) vanished on the very next save.
Mint a stable synthetic GUID for non-Figma-shaped property IDs instead of
dropping them, memoized per export so defs/refs/assignments/variantPropSpecs
pointing at the same property stay consistent. Also fix INSTANCE_SWAP
default/preferred/assignment values, which reference target node IDs and
had the same GUID-shape assumption, and were never being resolved back to
real node IDs on import in the first place (remapComponentIds only handled
instance.componentId, not these fields).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
783cdf9dbc