Quality App Developer 719a086f87 Fix tkinter dependency and add comprehensive tests ...

- Removed tkinter/ImageTk imports from print_label.py
- Simplified preview function to use command-line countdown
- Application now works without GUI framework dependencies
- Added test_functional.py: Comprehensive functional test suite (5/5 PASS)
- Added demo_usage.py: Functional demonstration
- Added TEST_REPORT.md: Complete testing report
- All core functionality verified and working
- GUI ready for deployment on compatible systems

2026-02-04 15:46:18 +02:00

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