Schema Compare:
- Add checkbox per diff item for selective sync (with select-all)
- SQL preview now reactively updates based on checked items
- Add swap button to exchange source↔target
- Execute sync now runs statement-by-statement with progress indicator
- Show detailed error report for failed statements
Data Compare:
- Add swap button to exchange source↔target
- Execute sync now runs statement-by-statement with progress indicator
- Show error summary and per-statement failures