Replace pandas+openpyxl with exceljs for Excel file processing. This
migration enables seamless integration with the Electron main process
and maintains 1:1 functional parity with the Python implementation.
Key changes:
- Add exceljs dependency (v4.4.0)
- Implement ExcelConverter class in TypeScript with strict types
- Add comprehensive unit tests (13 test cases, all passing)
- Support field name mapping, order parsing, and material extraction
- Handle empty data tables and file conflicts gracefully
Verification:
- Successfully tested with sample Excel file (99 orders, 625 records)
- All unit tests passing
- Output format matches Python version
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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