Repaired image loading issue in Equipment section.

New Features:
• Spirometry Predictions - Calculate predicted lung function values using the latest GLI Global 2022 and GLI-2017 equations
  - Race-neutral spirometry predictions (FEV1, FVC, FEV1/FVC)
  - Lung volume calculations (FRC, TLC, RV, IC, ERV, VC)
  - Diffusing capacity (DLCO/TLCO, VA, KCO)
  - Clinically validated reference values for ages 3-95
  - Includes guidance for incentive spirometry therapy

Improvements:
• Enhanced patient data persistence - Your patient records now save reliably across app sessions
• Improved data backup system - Automatic hourly backups with restoration capability
• Better memory management for smoother performance
• Updated clinical references in About/Works Cited section

Bug Fixes:
• Fixed issue where patient data could be lost on app restart
• Resolved calculation accuracy issues in spirometry predictions
• Corrected age limit validations for lung function tests
• Fixed height unit conversion precision

All spirometry calculations are based on peer-reviewed research and validated against official GLI calculators. Perfect for respiratory therapists, pulmonologists, and healthcare students.