TEST-ONLY: render serialized state onto a fresh copy of rawSvgText and return the in-document-order active-layer fingerprint (id + opacity + class per element). Used by the SP2 parity harness; not part of the public API.
serialized
rawSvgText
TEST-ONLY: render
serializedstate onto a fresh copy ofrawSvgTextand return the in-document-order active-layer fingerprint (id + opacity + class per element). Used by the SP2 parity harness; not part of the public API.