fix: game audio persistence and editor perf

- Keep game/campaign audio assets referenced (no prune)
- Flush pending project save on quit/switch/export to avoid losing campaignAudios
- Control: prevent game music restarts on scene changes; allow always-on controls; handle autoplay-after-scene-audio
- Editor: reduce ReactFlow churn with stable scene card map; lazy/async image decode
- Add contract/unit tests and update test script

Made-with: Cursor

app/main/project/zipRead.test.ts

@@ -51,3 +51,48 @@ void test('readProjectJsonFromZip: sequential reads close yauzl (no EMFILE)', as
 
   await fs.rm(tmp, { recursive: true, force: true });
 });
+
+void test('readProjectJsonFromZip: campaignAudios round-trips inside project.json', async () => {
+  const tmp = await fs.mkdtemp(path.join(os.tmpdir(), 'dnd-zip-campaign-'));
+  const zipPath = path.join(tmp, 'test.dnd.zip');
+  const assetId = 'audio_asset_1';
+  const minimal = {
+    id: 'p1',
+    meta: {
+      name: 'n',
+      fileBaseName: 'f',
+      createdAt: '2020-01-01',
+      updatedAt: '2020-01-01',
+      createdWithAppVersion: '1',
+      appVersion: '1',
+      schemaVersion: PROJECT_SCHEMA_VERSION,
+    },
+    scenes: {},
+    assets: {},
+    campaignAudios: [{ assetId, autoplay: true, loop: false }],
+    currentSceneId: null,
+    currentGraphNodeId: null,
+    sceneGraphNodes: [],
+    sceneGraphEdges: [],
+  };
+
+  const zipfile = new ZipFile();
+  zipfile.addBuffer(Buffer.from(JSON.stringify(minimal), 'utf8'), 'project.json', { compressionLevel: 9 });
+  const out = fssync.createWriteStream(zipPath);
+  const done = new Promise<void>((resolve, reject) => {
+    out.on('close', resolve);
+    out.on('error', reject);
+  });
+  zipfile.outputStream.pipe(out);
+  zipfile.end();
+  await done;
+
+  const p = await readProjectJsonFromZip(zipPath);
+  assert.ok(Array.isArray((p as { campaignAudios?: unknown }).campaignAudios));
+  assert.deepEqual(
+    (p as { campaignAudios: typeof minimal.campaignAudios }).campaignAudios,
+    minimal.campaignAudios,
+  );
+
+  await fs.rm(tmp, { recursive: true, force: true });
+});