feat: save games and edit scene darkness

Persist show state to local saves; author map darkness in scene editor with bake-to-scene and help updates.

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

app/main/sceneTraps/sceneTrapsStore.ts

@@ -131,4 +131,29 @@ export class SceneTrapsStore {
       }
     }
   }
+
+  exportByCard(): Record<string, Record<string, SceneTrapRuntime>> {
+    if (this.currentKey !== null) {
+      this.cache.set(this.currentKey, cloneById(this.state.byId));
+    }
+    const out: Record<string, Record<string, SceneTrapRuntime>> = {};
+    for (const [key, byId] of this.cache) {
+      const kept: Record<string, SceneTrapRuntime> = {};
+      for (const [id, runtime] of Object.entries(byId)) {
+        if (runtime.status === 'inactive' && !runtime.revealed) continue;
+        kept[id] = { ...runtime };
+      }
+      if (Object.keys(kept).length > 0) out[key] = kept;
+    }
+    return out;
+  }
+
+  importByCard(byCard: Record<string, Record<string, SceneTrapRuntime>>): void {
+    this.cache.clear();
+    this.currentKey = null;
+    this.state = emptyState();
+    for (const [key, byId] of Object.entries(byCard)) {
+      this.cache.set(key, cloneById(byId));
+    }
+  }
 }