- TemplateManage: add uniqueness check for smart fields to prevent duplicate inserts
- Add red circular delete button to smart-field-wrapper (visible on hover via CSS)
- Enhance keydown handler to delete smart fields at block-level boundaries
- Update defaultContent.ts smartField() to include delete-btn
- ReportManage: add per-row checkboxes, select-all, bulk delete
- Add single-report export modal (PDF via printDocument, JSON via Blob)
- Add bulk export actions for PDF and JSON
- Update experience record (#16)
