feat: add version updater and statistics enhancements (fixes #29)

- Implemented version checking system with update notifications
- Integrated Git for fetching and downloading the latest version
- Added statistics updates
- Removed unused code across the project
- Condensed project structure
- Updated README
- Cleaned up UI

TUI/Widgets/OTP_generate.py

@@ -43,7 +43,6 @@ class OTPGenerator(Widget):
     # Reactive properties to track form completion
     requestor_filled = reactive(False)
     reasoning_filled = reactive(False)
-    duration_selected = reactive(True)  # Default is selected
     otp_generated = reactive(False)
 
     class OTPInfo(Message):