Add medicine management functionality with UI and data handling

- Implemented MedicineManagementWindow for adding, editing, and removing medicines.
- Created MedicineManager to handle medicine configurations, including loading and saving to JSON.
- Updated UIManager to dynamically generate medicine-related UI components based on the MedicineManager.
- Enhanced test suite with mock objects for MedicineManager to ensure proper functionality in DataManager tests.
- Added validation for medicine input fields in the UI.
- Introduced default medicine configurations for initial setup.

tests/test_graph_manager.py

@@ -6,8 +6,7 @@ import pytest
 import pandas as pd
 import tkinter as tk
 from tkinter import ttk
-from unittest.mock import Mock, patch, MagicMock
-import matplotlib.pyplot as plt
+from unittest.mock import Mock, patch
 
 import sys
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', 'src'))