Chandler Copeland 34ed0baa43 test(05-01): add unit tests for Y-flip coordinate conversion formula ...

- Created src/lib/pdf/__tests__/prepare-document.test.ts with 10 test cases
- Tests verify Y-axis flip: screenY=0 → pdfY≈792, screenY=792 → pdfY≈0
- Tests verify scale-invariance at both 1:1 and 50% zoom ratios
- Installed jest, ts-jest, @types/jest and added jest config to package.json
- All 10 tests pass

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-03-19 23:55:27 -06:00

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