feat: Update medicine toggles to be unchecked by default for improved user experience

src/graph_manager.py

@@ -45,9 +45,9 @@ class GraphManager:
         for pathology_key in self.pathology_manager.get_pathology_keys():
             self.toggle_vars[pathology_key] = tk.IntVar(value=1)
 
-        # Initialize medicine toggles
+        # Initialize medicine toggles (unchecked by default)
         for medicine_key in self.medicine_manager.get_medicine_keys():
-            self.toggle_vars[medicine_key] = tk.IntVar(value=1)
+            self.toggle_vars[medicine_key] = tk.IntVar(value=0)
 
     def _setup_ui(self) -> None:
         """Set up the UI components with performance optimizations."""