Replace BFS (which skipped DSD-modified nodes in visited set, breaking
the chain for deeper clones) with iterative convergence loop. Track
dsdSizeSet separately from dsdModified so nodes with only position/
geometry changes inherit size from their source.
Fix transitive override propagation: re-clone from source (not component)
to preserve componentId chain for DSD. Add syncChildrenDeep for deep
property propagation (stroke colors on nested vectors).
Reduces vector overflow in gold-preview.fig from 25 to 0 (visible,
unclipped).
f6a12cc736