2 bugs:
1. After Magic/base download completes, progress bar stayed stuck at
77% because exportProgress was never updated to 'done' client-side.
Fix: set progress to 'Finalizat' + 100% after successful blob download.
2. syncLayer overwrote the export route's weighted percentages (0-100)
with raw feature counts (50/200), causing progress bar to jump.
Fix: when isSubStep=true, sync writes phase/note/phaseCurrent/phaseTotal
but preserves the parent route's downloaded/total weighted values.
AI Assistant
de1e779770