Add option for hiding / showing gridlines (#10545)

Might be useful who want to use custom grid line system with textures. or a clean look

### PROBLEM / SCENARIOS
• Custom made textures overlapping with grid system. so it might be confusing for user if want to use specific markings
• User may found its a distracting item and wants a clean look

### SOLUTION
added to view menu
<img width="477" height="434" alt="Screenshot-20251230192707" src="https://github.com/user-attachments/assets/e298d9b2-5f8f-4e33-af22-ea7c84c9b5b8" />

added to canvas menu
<img width="278" height="297" alt="Screenshot-20251230192717" src="https://github.com/user-attachments/assets/a9952408-a361-4e64-ad9a-72e2480c74cf" />

Clean look without gridlines
<img width="1669" height="1157" alt="Screenshot-20250827144140" src="https://github.com/user-attachments/assets/9229f330-9543-4d39-a8fc-01deb9b61336" />

<img width="1669" height="1157" alt="Screenshot-20250827144212" src="https://github.com/user-attachments/assets/ab3848fb-74d7-4618-8bc7-0cdff10a3804" />


Few Examples with custom made textures / markings without gridlines
<img width="1669" height="1157" alt="Screenshot-20250827140008" src="https://github.com/user-attachments/assets/5d7b17ab-e97a-489c-9e4d-99157a37b6b7" />

<img width="1669" height="1157" alt="Screenshot-20250827141904" src="https://github.com/user-attachments/assets/a7e0f360-a85a-489d-9bc2-39286984643a" />

src/slic3r/GUI/PartPlate.cpp

@@ -3241,7 +3241,7 @@ void PartPlate::render(const Transform3d& view_matrix, const Transform3d& projec
         shader->stop_using();
     }
 
-    if (show_grid)
+    if (wxGetApp().show_plate_gridlines() && show_grid)
         render_grid(bottom);
 
     if (!bottom && m_selected && !force_background_color) {