feat: Remove unused imports from test files for cleaner code

tests/test_main.py

@@ -4,7 +4,7 @@ Tests for the main application and MedTrackerApp class.
 import os
 import pytest
 import tkinter as tk
-from unittest.mock import Mock, patch, MagicMock
+from unittest.mock import Mock, patch
 import pandas as pd
 
 import sys