Refactor MedTrackerApp and UI components for improved structure and readability

- Simplified initialization logic in init.py
- Consolidated testing_mode assignment
- Removed unnecessary else statements
- Created UIManager class to handle UI-related tasks
- Modularized input frame creation, table frame creation, and graph frame creation
- Enhanced edit window creation with better organization and error handling
- Updated data management methods to improve clarity and maintainability
- Improved logging for better debugging and tracking of application flow

Pipfile

@@ -19,11 +19,11 @@ pytz = "==2025.2"
 six = "==1.17.0"
 tzdata = "==2025.2"
 colorlog = "*"
+dotenv = "*"
 
 [dev-packages]
 pre-commit = "*"
 pyinstaller = "*"
-dotenv = "*"
 
 [requires]
 python_version = "3.13"