feat(traps): activation VFX/SFX, explosion effect, and help section

Wire mimic/pit/arrow/laser media on activate, poison/explosion via effects, and document the scene editor and traps in Instructions.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/main/sceneTraps/sceneTrapsStore.test.ts

@@ -0,0 +1,38 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+
+import { SceneTrapsStore } from './sceneTrapsStore';
+
+void test('SceneTrapsStore: сохраняет runtime при переключении сцен внутри сессии', () => {
+  const store = new SceneTrapsStore();
+  store.switchScene('scene_a', ['t1']);
+  store.dispatch({ kind: 'activate', trapId: 't1' });
+  assert.equal(store.getState().byId.t1?.status, 'active');
+  assert.equal(store.getState().byId.t1?.revealed, true);
+
+  store.switchScene('scene_b', ['t2']);
+  assert.equal(store.getState().byId.t2?.status, 'inactive');
+
+  store.switchScene('scene_a', ['t1']);
+  assert.equal(store.getState().byId.t1?.status, 'active');
+  assert.equal(store.getState().byId.t1?.revealed, true);
+});
+
+void test('SceneTrapsStore: resetSession сбрасывает кэш к дефолту (кнопка «Запустить»)', () => {
+  const store = new SceneTrapsStore();
+  store.switchScene('scene_a', ['t1', 't2']);
+  store.dispatch({ kind: 'reveal', trapId: 't1' });
+  store.dispatch({ kind: 'activate', trapId: 't2' });
+  assert.equal(store.getState().byId.t1?.revealed, true);
+  assert.equal(store.getState().byId.t2?.status, 'active');
+  assert.ok(store.getState().lastActivation);
+
+  store.resetSession();
+  store.switchScene('scene_a', ['t1', 't2']);
+
+  assert.equal(store.getState().byId.t1?.status, 'inactive');
+  assert.equal(store.getState().byId.t1?.revealed, false);
+  assert.equal(store.getState().byId.t2?.status, 'inactive');
+  assert.equal(store.getState().byId.t2?.revealed, false);
+  assert.equal(store.getState().lastActivation, null);
+});