fix: Add parent window reference to dose entry error and success messages

src/ui_manager.py

@@ -643,10 +643,14 @@ class UIManager:
 
         dose = dose_entry_var.get().strip()
 
+        # Find the parent edit window
+        parent_window = dose_text_widget.winfo_toplevel()
+
         if not dose:
             messagebox.showerror(
                 "Error",
                 f"Please enter a dose amount for {medicine_name}",
+                parent=parent_window,
             )
             return
 
@@ -673,6 +677,7 @@ class UIManager:
         messagebox.showinfo(
             "Success",
             f"{medicine_name.title()} dose recorded: {dose} at {time_str}",
+            parent=parent_window,
         )
 
     def _parse_dose_text(self, text: str, date: str) -> str: