Traps and doors made in a new forge room, installed by imps; new creature: the cogling

- forge room: creatures work there (coglings fastest), the work goes into the oldest planned trap or door; finished pieces wait as crates, imps carry and install them
- traps: spike pit, poison vent (cloud), fire jet, stone roller, alarm bell (calls creatures), rune mine (one big blast), frost glow (slows around it)
- doors: wood, iron, magic (hurls attackers back); own creatures pass, enemies smash them on their way; clicking a door with a door tool locks it for everybody
- new 'Traps' category in the toolbar, forge in the rooms; texts EN/DE, bestiary entries; atlas grown for new textures and icons
- tests: forge to installed trap, spikes hurt, doors lock and get smashed

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

src/main.rs

@@ -20,6 +20,7 @@ mod save;
 mod settings;
 mod sfx;
 mod tracks;
+mod traps;
 mod sound;
 mod touch;
 mod ui;
@@ -115,6 +116,7 @@ fn world_action(app: &mut App, ui: &mut Ui, r3d: &R3d, inp: &mut Input, mx: f32,
         (Tool::Heal, _) => app.game.heal(wx, wy),
         (Tool::Summon, _) => app.game.summon(wx, wy),
         (Tool::Tower(k), Some((x, z))) => app.game.build_tower(k, x, z),
+        (Tool::Trap(k), Some((x, z))) => app.game.place_trap(k, x, z),
         _ => {}
     }
 }
@@ -564,7 +566,8 @@ async fn main() {
         // ---------------- keyboard (only while playing)
         if playing {
             for i in 0..TOOLS.len() {
-                if is_key_pressed(key(Action::Tool(i))) && app.game.tool_allowed(i) {
+                let k = key(Action::Tool(i));
+                if k != KeyCode::Unknown && is_key_pressed(k) && app.game.tool_allowed(i) && app.game.tool_visible(i) {
                     ui.tool = TOOLS[i];
                     inp.ldown = None;
                 }
@@ -1043,6 +1046,7 @@ fn draw_frame(app: &mut App, gfx: &Gfx, r3d: &mut R3d, ui: &mut Ui, menu: &mut M
         Tool::Bridge => (Color::new(0.9, 0.7, 0.4, 1.0), None),
         Tool::Steel => (Color::new(0.75, 0.8, 0.9, 1.0), None),
         Tool::Tower(_) => (Color::new(1.0, 0.6, 0.25, 1.0), None),
+        Tool::Trap(_) => (Color::new(1.0, 0.4, 0.3, 1.0), None),
     };
     let ov = Overlay {
         hover: if over_ui { None } else { hover_tile.filter(|&(x, z)| inb(x, z)) },