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/tokens/tokenPathSessionStore.ts

@@ -166,6 +166,19 @@ export class TokenPathSessionStore {
       }
     }
   }
+
+  load(
+    playback: TokenPathSessionState['playback'],
+    presentationVisible: TokenPathSessionState['presentationVisible'],
+  ): TokenPathSessionState {
+    this.state = {
+      revision: this.state.revision + 1,
+      playback: { ...playback },
+      presentationVisible: { ...presentationVisible },
+      serverNowMs: Date.now(),
+    };
+    return this.state;
+  }
 }
 
 export type { TokenPathTargetRef };