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/shared/ipc/contracts.ts

@@ -34,6 +34,7 @@ import type {
   DisplayInfo,
   Scene,
   SceneDarknessEvent,
+  SceneDarknessRevealStroke,
   SceneDarknessState,
   SceneMarkerEvent,
   SceneMarkerState,
@@ -166,6 +167,11 @@ export const ipcChannels = {
     materialUpsertProgress: 'project.materialUpsertProgress',
     npcUpsertProgress: 'project.npcUpsertProgress',
   },
+  gameSave: {
+    list: 'gameSave.list',
+    write: 'gameSave.write',
+    isDirty: 'gameSave.isDirty',
+  },
   windows: {
     openMultiWindow: 'windows.openMultiWindow',
     closeMultiWindow: 'windows.closeMultiWindow',
@@ -787,8 +793,20 @@ export type IpcInvokeMap = {
     res: { ok: true };
   };
   [ipcChannels.windows.openMultiWindow]: {
-    req: { playerIds?: string[] };
-    res: { ok: true };
+    req: { playerIds?: string[]; saveId?: string };
+    res: { ok: true; project: Project | null };
+  };
+  [ipcChannels.gameSave.list]: {
+    req: Record<string, never>;
+    res: { saves: { id: string; name: string; savedAt: string }[] };
+  };
+  [ipcChannels.gameSave.write]: {
+    req: { id: string | null; name: string };
+    res: { save: { id: string; name: string; savedAt: string } };
+  };
+  [ipcChannels.gameSave.isDirty]: {
+    req: Record<string, never>;
+    res: { dirty: boolean };
   };
   [ipcChannels.windows.closeMultiWindow]: {
     req: Record<string, never>;
@@ -1268,6 +1286,7 @@ export type ScenePatch = {
   previewVideoAutostart?: boolean;
   previewRotationDeg?: 0 | 90 | 180 | 270;
   darkenScene?: boolean;
+  darknessStrokes?: SceneDarknessRevealStroke[];
   traps?: SceneTrap[];
   tokens?: SceneToken[];
   npcTokens?: SceneNpcToken[];