Build menu: traps, doors, steel walls and siege engines; new tools unlock by mission

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

src/ui.rs

@@ -446,9 +446,9 @@ pub const CATS: [(&str, &[usize]); 7] = [
     ("cat.hand", &[1]),
     ("cat.rooms", &[2, 3, 4, 5, 6, 12, 40, 13, 18, 21, 41, 42, 43, 44, 17, 47, 49]),
     ("cat.towers", &[14, 15, 16, 20]),
-    ("cat.traps", &[22, 23, 24, 25, 26, 27, 28, 29, 30, 31]),
+    ("cat.traps", &[22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 19, 50, 51]),
     ("cat.spells", &[9, 10, 11, 32, 33, 34, 35, 36, 37, 38, 39, 48]),
-    ("cat.orders", &[8, 45, 46, 7, 19, 50, 51]),
+    ("cat.orders", &[8, 45, 46, 7]),
 ];
 
 #[derive(Clone, Copy, PartialEq, Debug)]
@@ -1156,7 +1156,7 @@ impl Ui {
                     hover_tool = Some(i);
                 }
                 let key = if touch_ui() { "" } else { keys[i].as_str() };
-                let r = tool_button(bx, by, bw, ti.icon, key, &ti.label, self.tool == TOOLS[i], hovered, !g.tool_allowed(i));
+                let r = tool_button(bx, by, bw, ti.icon, key, &ti.label, self.tool == TOOLS[i], hovered, !g.tool_allowed(i) || (matches!(TOOLS[i], Tool::Siege(_)) && g.forge_tiles() == 0));
                 self.touch_btns.push((r, TBtn::Tool(i)));
             }
             popup_top = py0;