feat(scene): keep map tokens with preview rotation

When previewRotationDeg changes, remap non-player, NPC and trap
markers (plus live session token overrides) so they stay on the art.

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

app/main/index.ts

@@ -20,6 +20,10 @@ import {
 } from '../shared/project/projectZipExtension';
 import type { Project } from '../shared/types';
 import { asNpcId } from '../shared/types/ids';
+import {
+  asPreviewRotationDeg,
+  previewRotationStepsCw,
+} from '../shared/types/scenePreviewRotation';
 
 import { EffectsStore, effectsDefaultTool } from './effects/effectsStore';
 import { SceneDarknessStore } from './effects/sceneDarknessStore';
@@ -678,6 +682,7 @@ async function main() {
     };
   });
   registerHandler(ipcChannels.project.updateScene, async ({ sceneId, patch }) => {
+    const before = projectStore.getOpenProject()?.scenes[sceneId];
     const next = await projectStore.updateScene(sceneId, patch);
     const project = projectStore.getOpenProject();
     if (project?.currentSceneId === sceneId && patch.darkenScene !== undefined) {
@@ -688,6 +693,29 @@ async function main() {
       syncSceneTrapsForProject(project);
       emitSceneTrapsState();
     }
+    if (
+      project?.currentSceneId === sceneId &&
+      patch.previewRotationDeg !== undefined &&
+      before
+    ) {
+      const steps = previewRotationStepsCw(
+        asPreviewRotationDeg(before.previewRotationDeg),
+        asPreviewRotationDeg(patch.previewRotationDeg),
+      );
+      if (steps !== 0) {
+        sceneTokensSessionStore.rotateMapCwSteps(steps);
+        sceneNpcTokensSessionStore.rotateMapCwSteps(steps);
+        scenePlayerTokensSessionStore.rotateMapCwSteps(steps);
+        emitSceneTokensSessionState();
+        emitSceneNpcTokensSessionState();
+        emitScenePlayerTokensSessionState();
+      }
+    }
+    if (project && project.currentSceneId === sceneId && patch.previewRotationDeg !== undefined) {
+      // Trap ids stay the same; runtime statuses remain valid after coordinate remap in project.
+      syncSceneTrapsForProject(project);
+      emitSceneTrapsState();
+    }
     emitSessionState();
     return { scene: next };
   });