feat: Center main window on screen during initialization

src/main.py

@@ -67,6 +67,29 @@ class MedTrackerApp:
         # Add menu bar
         self._setup_menu()
 
+        # Center the window on screen
+        self._center_window()
+
+    def _center_window(self) -> None:
+        """Center the main window on the screen."""
+        # Update the window to get accurate dimensions
+        self.root.update_idletasks()
+
+        # Get window dimensions
+        window_width = self.root.winfo_reqwidth()
+        window_height = self.root.winfo_reqheight()
+
+        # Get screen dimensions
+        screen_width = self.root.winfo_screenwidth()
+        screen_height = self.root.winfo_screenheight()
+
+        # Calculate position to center the window
+        x = (screen_width // 2) - (window_width // 2)
+        y = (screen_height // 2) - (window_height // 2)
+
+        # Set the window geometry
+        self.root.geometry(f"{window_width}x{window_height}+{x}+{y}")
+
     def _setup_main_ui(self) -> None:
         """Set up the main UI components."""
         import tkinter.ttk as ttk