fix(mtext): sync wrap width ruler

src/app/update/mod.rs

@@ -3064,6 +3064,13 @@ impl OpenCADStudio {
                 self.rebuild_mtext_preview();
                 Task::none()
             }
+            Message::MTextRectWidth(width) => {
+                if let Some(ed) = self.mtext_editor.as_mut() {
+                    ed.rect_width = width.max(1e-6);
+                }
+                self.rebuild_mtext_preview();
+                Task::none()
+            }
             Message::MTextColorChanged(color) => {
                 self.mtext_apply_color(color);
                 Task::none()