Checkpoint: Fixed LibreView PDF import: replaced broken base64/atob approach with expo-pdf-text-extract (native PDFBox on Android). Corrected parsing strategy validated against actual GregoryRoby_05-21-2026.pdf — extracts all 14 daily glucose values correctly, plus avg=141, GMI=6.7%, TIR=86%, variability=24.2%. TypeScript clean, 39 tests pass.
