Raise walls: plan them on own floor, imps build reinforced earth

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

src/commands.rs

@@ -34,6 +34,7 @@ pub enum Act {
     Sell(Rect),
     Bridge(Rect),
     Steel(Rect),
+    Wall(Rect),       // plan walls on own floor (or cancel planned ones)
     Drawbridge(Rect), // build drawbridges, or (one tile on an own drawbridge) switch it: down, up, automatic
     Tower {
         kind: TowerKind,
@@ -142,7 +143,7 @@ impl Game {
             Act::Dig(r) => (rect_center(r), MARK_DIG, 4.0),
             Act::Room { r, .. } => (rect_center(r), MARK_ROOM, 5.0),
             Act::Sell(r) => (rect_center(r), MARK_SELL, 4.0),
-            Act::Bridge(r) | Act::Drawbridge(r) => (rect_center(r), MARK_BRIDGE, 4.0),
+            Act::Bridge(r) | Act::Drawbridge(r) | Act::Wall(r) => (rect_center(r), MARK_BRIDGE, 4.0),
             Act::Steel(r) => (rect_center(r), MARK_STEEL, 4.0),
             Act::Tower { x, y, .. } => (point(x as f32, y as f32), MARK_TOWER, 6.0),
             Act::Trap { x, y, .. } => (point(x as f32, y as f32), MARK_TRAP, 6.0),
@@ -187,6 +188,7 @@ impl Game {
             Act::Sell(r) => self.sell_rect(r.x0, r.y0, r.x1, r.y1),
             Act::Bridge(r) => self.build_bridges(r.x0, r.y0, r.x1, r.y1),
             Act::Drawbridge(r) => self.drawbridge_order(r.x0, r.y0, r.x1, r.y1),
+            Act::Wall(r) => self.plan_walls(r.x0, r.y0, r.x1, r.y1),
             Act::Steel(r) => self.build_steel(r.x0, r.y0, r.x1, r.y1),
             Act::Tower { kind, x, y } => self.build_tower(kind, x, y),
             Act::Trap { kind, x, y } => self.place_trap(kind, x, y),