feat(scene): shared zoom/pan for control and presentation

Keep effects pinned to map coordinates when the viewport changes; materials/NPC overlays stay screen-fixed.

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

app/shared/ipc/contracts.ts

@@ -20,6 +20,8 @@ import type {
   SceneDarknessEvent,
   SceneDarknessState,
   SceneId,
+  SceneViewEvent,
+  SceneViewState,
   VideoPlaybackEvent,
   VideoPlaybackState,
 } from '../types';
@@ -143,6 +145,11 @@ export const ipcChannels = {
     dispatch: 'sceneDarkness.dispatch',
     stateChanged: 'sceneDarkness.stateChanged',
   },
+  sceneView: {
+    getState: 'sceneView.getState',
+    dispatch: 'sceneView.dispatch',
+    stateChanged: 'sceneView.stateChanged',
+  },
   video: {
     getState: 'video.getState',
     dispatch: 'video.dispatch',
@@ -203,6 +210,7 @@ export type IpcEventMap = {
   [ipcChannels.materialsOverlay.stateChanged]: { state: MaterialsOverlayState };
   [ipcChannels.npcsOverlay.stateChanged]: { state: NpcsOverlayState };
   [ipcChannels.sceneDarkness.stateChanged]: { state: SceneDarknessState };
+  [ipcChannels.sceneView.stateChanged]: { state: SceneViewState };
   [ipcChannels.video.stateChanged]: { state: VideoPlaybackState };
   [ipcChannels.license.statusChanged]: { snapshot: LicenseSnapshot };
   [ipcChannels.windows.multiWindowStateChanged]: { open: boolean };
@@ -593,6 +601,14 @@ export type IpcInvokeMap = {
     req: { event: SceneDarknessEvent };
     res: { ok: true };
   };
+  [ipcChannels.sceneView.getState]: {
+    req: Record<string, never>;
+    res: { state: SceneViewState };
+  };
+  [ipcChannels.sceneView.dispatch]: {
+    req: { event: SceneViewEvent };
+    res: { ok: true };
+  };
   [ipcChannels.video.getState]: {
     req: Record<string, never>;
     res: { state: VideoPlaybackState };
@@ -630,6 +646,7 @@ export type LegacyIpcEventMap = {
   [ipcChannels.materialsOverlay.stateChanged]: { state: MaterialsOverlayState };
   [ipcChannels.npcsOverlay.stateChanged]: { state: NpcsOverlayState };
   [ipcChannels.sceneDarkness.stateChanged]: { state: SceneDarknessState };
+  [ipcChannels.sceneView.stateChanged]: { state: SceneViewState };
   [ipcChannels.video.stateChanged]: { state: VideoPlaybackState };
   [ipcChannels.license.statusChanged]: Record<string, never>;
 };