3D pixel look follows the window size

The 3D resolution setting refers to a window 1080 device pixels high; smaller windows use a
proportionally smaller divisor (1/1 stays full resolution). Settings show the divisor in effect.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/menu.rs

@@ -111,7 +111,15 @@ fn item_value(it: Item, s: &Settings) -> String {
                 format!("{}x", s.ui_factor)
             }
         }
-        Item::RenderScale => format!("1/{}", s.render_scale.max(1)),
+        Item::RenderScale => {
+            // the setting is for a 1080 pixel high window; show what applies to this one
+            let now = crate::render3d::effective_div(s.render_scale.max(1) as u32, crate::ui::sh());
+            if now as u8 == s.render_scale.max(1) {
+                format!("1/{}", s.render_scale.max(1))
+            } else {
+                format!("1/{} (1/{})", s.render_scale.max(1), now)
+            }
+        }
         Item::GameSpeed => format!("{}x", s.game_speed as i32),
         Item::Hints => onoff(s.hints),
         Item::TouchUi => match s.touch_ui {