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/initiative/initiativeSessionStore.ts

@@ -315,4 +315,16 @@ export class InitiativeSessionStore {
     this.state = next;
     return this.state;
   }
+
+  load(next: Omit<InitiativeState, 'revision'>): InitiativeState {
+    this.state = ensureActiveValid({
+      ...next,
+      revision: this.state.revision + 1,
+      entries: { ...next.entries },
+      order: [...next.order],
+      reserve: [...next.reserve],
+      conditions: { ...next.conditions },
+    });
+    return this.state;
+  }
 }