New documentation file covering:
- Calendar day offset fix (January 1 now shows correctly as Thursday)
- Business hours fix (now shows 10:00-19:00 instead of 22:00-23:00)
- Test links page creation
- FASE 5 and FASE 6 completion status
- Impact on project progress (FASE 3, 5, 6 now 100% complete)
Detailed sections:
- Problem symptoms and root causes
- Solution implementations with code examples
- Before/after visual comparisons
- Files modified and commits references
- Validation and testing notes
- How to apply changes in dev/production
