Command markers only with the debug setting; removing a marker clears them at once

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

src/orders.rs

@@ -109,6 +109,8 @@ impl Game {
     // a right click with an order tool: the marker there goes (its creatures are free again);
     // without a marker there the guards stand down
     pub fn unmark(&mut self, wx: f32, wy: f32) {
+        // the command markers there go with it
+        self.marks.retain(|m| (m.x - wx).powi(2) + (m.y - wy).powi(2) >= 2.0 * 2.0);
         let near = |m: &usize| {
             let (mx, my) = xy(*m);
             (mx as f32 + 0.5 - wx).powi(2) + (my as f32 + 0.5 - wy).powi(2) < 1.6 * 1.6