fix(grid): remove implicit drawing limits

src/app/document.rs

@@ -438,7 +438,7 @@ impl DocumentTab {
     pub(super) fn new_drawing(n: usize) -> Self {
         let mut scene = Scene::new();
         linetypes::populate_document(&mut scene.document);
-        // Override acadrust's imperial default limits (12×9) with A4 landscape.
+        // Paper layouts start as A4 landscape.
         for obj in scene.document.objects.values_mut() {
             if let acadrust::objects::ObjectType::Layout(l) = obj {
                 if l.name != "Model" {

src/ui/overlay.rs

@@ -1589,6 +1589,28 @@ fn draw_grid(
             }
         }
         draw_segments(frame, &segments);
+
+        // LIMITS bounds the grid, not the UCS axes. Size the axes from the
+        // visible grid plane so X/Y/Z still span the viewport even when the
+        // finite grid rectangle is small or currently off-screen.
+        let axis_extent = samples.iter().fold(0.0_f32, |extent, (_, world)| {
+            let delta = (*world - grid_origin).as_vec3();
+            extent
+                .max(delta.dot(axis1).abs())
+                .max(delta.dot(axis2).abs())
+        });
+        if axis_extent > 0.0 {
+            let extent = (axis_extent + s) * 1.5;
+            draw_axes(
+                frame,
+                view_rot,
+                eye,
+                bounds,
+                extent.max(10.0),
+                grid_origin,
+                (gx, gy, gz),
+            );
+        }
         return;
     }