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/renderer/editor/state/projectState.race.test.ts

@@ -34,3 +34,11 @@ void test('ipc router: project.list does not require license', () => {
   const routerSrc = fs.readFileSync(path.join(here, '..', '..', '..', 'main', 'ipc', 'router.ts'), 'utf8');
   assert.match(routerSrc, /if \(channel === ipcChannels\.project\.list\) return false/);
 });
+
+void test('projectState: openProject не выбирает сцену (selectedSceneId: null)', () => {
+  const src = fs.readFileSync(path.join(here, 'projectState.ts'), 'utf8');
+  assert.match(
+    src,
+    /const openProject = async[\s\S]+?openingProjectId: id, selectedSceneId: null[\s\S]+?selectedSceneId: null,\s*openingProjectId: null/,
+  );
+});